Dr. Harry C. Ioor #OR-GP2 cachet Harry C. Ioor
GP Cachets

U.S. First Day Cover Cachet Display Catalog:
Cachetmaker: Dr. Harry C. Ioor General Purpose Cachets

Part of the U.S. First Day Cover Cachet Display Catalog
by Douglas H. Henkle, AFDCS LM #137, henkle@pobox.com

(last updated .12-11-2025)

FDC Publishing Co. Planty Catalog Numbers (1901-1939)
FDC Publishing Co. Mellone Catalog Numbers (1940-1969)

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      This page displays First Day Covers with General Purpose (GP) cachets created by Dr. Harry C. Ioor (1882-1940) of Indianapolis, IN. All cachets I have seen are displayed in color. The "Photo Cachet Catalog: Harry Ioor" by Dr. M. Douglas Parks (1932-2018) is in black and white. Except as noted by "{A}" (from my personal collection), and (RHL) from Robert H. Lucier, all other displayed covers were found on the Web.

      What's New on this page

      Wanted: a 300 bpi / 600 pixel wide (or greater) .jpg scan of any unlisted cachet, and ALSO any cachet marked ***
Email it to: henkle@pobox.com
Subject for this page: Doug Henkle unlisted Harry Ioor General Purpose cachet
      (an email with any other subject or with any other graphical format will be ignored IF it has an attachment)

      U.S. Scott #nnn = U.S. Scott Catalog number.
      mm-dd-yyyy = First Day of Issue

      General Purpose (GP) cachet pages:
Eagles -- 1DC and 1DI -- FDC -- FDI -- FDOI
Identifier of all the GP's above on one page
General Purpose "Border" Cachets
Ioor General Purpose (GP) "Border" Cachets
Ioor General Purpose (GP) cachets (this page)

      Wanted: Cover Scans:
#OR-GP1 -- #OR-GP11 -- #OR-GP16 -- #OR-GP23 -- #OR-GP27
      Wanted: FDC Scans:
#OR-GP8a -- #OR-GP12 -- #OR-GP13 -- #OR-GP15 -- #OR-GP17 -- #OR-GP18 -- #OR-GP19 -- #OR-GP20 -- #OR-GP21 -- #OR-GP24 -- #OR-GP27 -- #OR-GP28

Thumbnails Menu:
      Catalog numbers assigned by Dr. M. Douglas Parks, e.g. "#OR-GP1"
GP1 Ioor General Purpose cachet #OR-GP1 Ioor General Purpose cachet #OR-GP1    GP2 Ioor General Purpose cachet #OR-GP2    GP3 Ioor General Purpose cachet #OR-GP3 Ioor General Purpose cachet #OR-GP3a    GP4 Ioor General Purpose cachet #OR-GP4    GP5 Ioor General Purpose cachet #OR-GP5    GP6 Ioor General Purpose cachet #OR-GP6 Ioor General Purpose cachet #OR-GP6a    GP7 Ioor General Purpose cachet #OR-GP7    GP8 Ioor General Purpose cachet #OR-GP8 Ioor General Purpose cachet #OR-GP8    GP9 Ioor General Purpose cachet #OR-GP9    GP10 Ioor General Purpose cachet #OR-GP10    GP11 Ioor General Purpose cachet #OR-GP11    GP12 Ioor General Purpose cachet #OR-GP12    GP13 Ioor General Purpose cachet #OR-GP13    GP14 Ioor General Purpose cachet #OR-GP14 Ioor General Purpose cachet #OR-GP14a Ioor General Purpose cachet #OR-GP14b Ioor General Purpose cachet #OR-GP14c    GP15 Ioor General Purpose cachet #OR-GP15 Ioor General Purpose cachet #OR-GP15a    GP16 Ioor General Purpose cachet #OR-GP16    GP17 Ioor General Purpose cachet #OR-gp17 Ioor General Purpose cachet #OR-GP17a    GP18 Ioor General Purpose cachet #OR-GP18    GP19 Ioor General Purpose cachet #OR-GP19    GP20 Ioor General Purpose cachet #OR-GP20    GP21 Ioor General Purpose cachet #OR-GP21    GP22 Ioor General Purpose cachet #OR-GP22    GP23 Ioor General Purpose cachet #OR-GP23    GP24 Ioor General Purpose cachet #OR-GP24    GP25 Ioor General Purpose cachet GP#Eagle3a    GP26 Ioor General Purpose cachet #OR-GP26 Ioor General Purpose cachet #OR-GP26 Ioor General Purpose cachet #OR-GP26 Ioor General Purpose cachet #OR-GP26    GP27 Ioor General Purpose cachet #OR-GP27    GP28 Ioor General Purpose cachet #OR-GP28    GP29 Ioor General Purpose cachet #OR-GP29 Ioor General Purpose cachet #OR-GP29    GP30 Ioor General Purpose cachet
  1. #OR-GP1 -- Dr. Harry C. Ioor General Purpose, black & red
          #U524-1, 1-01-1932
          I cannot find a cover without the dates and the text at the bottom shown as #U524-1.
    Ioor General Purpose cachet #OR-GP1 Ioor General Purpose cachet #OR-GP1 U.S. Scott #U524-1 - Ioor General Purpose cachet #OR-GP1
    #OR-GP1a -- Dr. Harry C. Ioor General Purpose, black & green
          #706-707-32bb.1, 1-01-1932 (on Ioor OR-B2)
    Ioor General Purpose cachet #OR-GP1a U.S. Scott #704-705 - Ioor General Purpose cachet #OR-GP1a, border OR-B2 U.S. Scott #706-707 - Ioor General Purpose cachet #OR-GP1a, border OR-B2
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  2. #OR-GP2 -- Dr. Harry C. Ioor General Purpose
          #722-GP5, 10-12-1932
    Ioor General Purpose cachet #OR-GP2 Ioor General Purpose cachet #OR-GP2 U.S. Scott #722-GP5 - Ioor General Purpose cachet #OR-GP2
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  3. #OR-GP3 -- Dr. Harry C. Ioor General Purpose, large
          #C19-21, 6-30-1934
    Ioor General Purpose cachet #OR-GP3 Ioor General Purpose cachet #OR-GP3 U.S. Scott #C19-21 - Ioor General Purpose cachet #OR-GP3
    #OR-GP3a -- Dr. Harry C. Ioor General Purpose, small
          #CE1-15, 8-30-1934
    Ioor General Purpose cachet #OR-GP3a U.S. Scott #CE1-15 - Ioor General Purpose cachet #OR-GP3a
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  4. #OR-GP4 -- Dr. Harry C. Ioor General Purpose
          #C19-GP1, 6-30-1934
    Ioor General Purpose cachet #OR-GP4 Ioor General Purpose cachet #OR-GP4 U.S. Scott #724 - Ioor General Purpose cachet #OR-GP4
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  5. #OR-GP5 -- Dr. Harry C. Ioor General Purpose
          #C19, 6-30-1934
    Ioor General Purpose cachet #OR-GP5 Ioor General Purpose cachet #OR-GP5 U.S. Scott #C19 - Ioor General Purpose cachet #OR-GP5
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  6. #OR-GP6 -- Dr. Harry C. Ioor General Purpose, red plane
          #C22-33, 2-15-1937
    Ioor General Purpose cachet #OR-GP6 Ioor General Purpose cachet #OR-GP6 U.S. Scott #C22-33 - Ioor General Purpose cachet #OR-GP6
    #OR-GP6.1-NIP -- Dr. Harry C. Ioor General Purpose, red plane without the underlined "VIA SPECIAL DELIVERY" printing
          #C22-33a-NIP, 2-15-1937
    U.S. Scott #C22-33a-NIP - Ioor General Purpose cachet #OR-GP6.1-NIP
    #OR-GP6a -- Dr. Harry C. Ioor General Purpose, green plane
          #C21-33, 2-15-1937
    Ioor General Purpose cachet #OR-GP6a U.S. Scott #C22-33 - Ioor General Purpose cachet #OR-GP6a U.S. Scott #C22-33 - Ioor General Purpose cachet #OR-GP6a
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  7. #OR-GP7 -- Dr. Harry C. Ioor General Purpose
          #E17, 10-30-1944 -- #CE2-2, 2-10-1936
    Ioor General Purpose cachet #OR-GP7 Ioor General Purpose cachet #OR-GP7 U.S. Scott #E17 - Ioor General Purpose cachet #OR-GP7 U.S. Scott #CE2 - Ioor General Purpose cachet #OR-GP7
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  8. #OR-GP8 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Patriotics: S2#10944, p. 393
    Ioor General Purpose cachet #OR-GP8 Ioor General Purpose cachet #OR-GP8 U.S. Scott #928 - Ioor General Purpose cachet #OR-GP8
    #OR-GP8a -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Patriotics: S2#10775, p. 390
    Ioor General Purpose cachet #OR-GP8 Ioor General Purpose cachet #OR-GP8 on event cover
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  9. #OR-GP9 -- Dr. Harry C. Ioor General Purpose
          #755-2a, 3-15-1935
    Ioor General Purpose cachet #OR-GP9 Ioor General Purpose cachet #OR-GP9 U.S. Scott #755-2a - Dr. Harry C. Ioor General Purpose OR-GP9
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  10. #OR-GP10 -- Dr. Harry C. Ioor General Purpose
          #857-GP22, 9-25-1939 [2nd day cancel] (RHL)
    Ioor General Purpose cachet #OR-GP10 Ioor General Purpose cachet #OR-GP10 U.S. Scott #806ee - Ioor General Purpose cachet #OR-GP10
    #OR-GP10a -- Dr. Harry C. Ioor General Purpose
          #803-851-1, XIV:10
    Ioor General Purpose cachet #OR-GP10a U.S. Scott #806ee - Ioor General Purpose cachet #OR-GP10a
    #OR-GP10b -- Dr. Harry C. Ioor General Purpose
          #815ee, 9-25-1941
    Ioor General Purpose cachet #OR-GP10a U.S. Scott #815ee - Ioor General Purpose cachet #OR-GP10b
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  11. #OR-GP11 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          I cannot find a cover with this design, which is the same as OR-GP12 (below) "without all the text and stars".
    Ioor General Purpose cachet #OR-GP11 Ioor General Purpose cachet #OR-GP12
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  12. #OR-GP12 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Patriotics: S2#3033, p. 207 -- S2#2656, p. 197 -- Lawrence Sherman identified them as by the Mission Stamp Club, not Ioor
    Ioor General Purpose cachet #OR-GP12 Ioor General Purpose cachet #OR-GP12 Ioor General Purpose cachet #OR-GP12 on a 2-14-1944 event cover (Sherman S2#3033) Ioor General Purpose cachet #OR-GP12 on a 2-14-1944 event cover (Sherman S2#2656)
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  13. #OR-GP13 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Patriotic: S2#10772 p. 390/397, with just the same flag and no text was identified by Lawrence Sherman as by Wesley Smith, not Ioor.
    Ioor General Purpose cachet #OR-GP13 Ioor General Purpose cachet #OR-GP13 Ioor General Purpose cachet #OR-GP13 U.S. Scott #724-GP14 - Ioor General Purpose cachet #OR-GP14
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  14. #OR-GP14 -- Dr. Harry C. Ioor General Purpose
          #717, 4-22-1932 -- #724-GP14, 10-24-1932 -- #734-GP9a, 10-13-1933 -- #788, 3-23-1937
          Patriotic: S2#10772 p. 390/397, with just the same flag and no text was identified by Lawrence Sherman as by Wesley Smith, not Ioor.
          OR-GP14 -- OR-GP14a -- OR-GP14b -- OR-GP14c
    Ioor General Purpose cachet #OR-GP14 Ioor General Purpose cachet #OR-GP14 Ioor General Purpose cachet #OR-GP14a Ioor General Purpose cachet #OR-GP14b Ioor General Purpose cachet #OR-GP14c
    U.S. Scott #724-GP14 - Ioor General Purpose cachet #OR-GP14 U.S. Scott #734-GP9a - Ioor General Purpose cachet #OR-GP14a U.S. Scott #788 - Ioor General Purpose cachet #OR-GP14b U.S. Scott #717 - Ioor General Purpose cachet #OR-GP14c
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  15. #OR-GP15 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Patriotic: S2#10772 p. 390/397, with just the same flag and no text was identified by Lawrence Sherman as by Wesley Smith, not Ioor.
    Ioor General Purpose cachet #OR-GP15 Ioor General Purpose cachet #OR-GP15 Ioor General Purpose cachet #OR-GP15 on 1940 event cover
    #OR-GP15a -- Dr. Harry C. Ioor General Purpose
          #723-GP17b, 8-18-1932
    Ioor General Purpose cachet S2#10772a U.S. Scott #723-GP17b - Ioor General Purpose cachet #OR-GP15a
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  16. #OR-GP16 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          I cannot find a cover with this design.
    Ioor General Purpose cachet #OR-GP16
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  17. #OR-GP17 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Patriotic: S1#9440 p. 316/321 and S2#10891, p. 392/397, per Lawrence Sherman
    Ioor General Purpose cachet #OR-GP17 Ioor General Purpose cachet #OR-gp17 Ioor General Purpose cachet #OR-gp17 on blank cover
    #OR-GP17a -- Dr. Harry C. Ioor General Purpose --- (eBay) / (filler Alan Warren)
          #806b, 1-27-1939 -- unused blank
    Ioor General Purpose cachet #OR-GP17a U.S. Scott #CE1 - Ioor General Purpose cachet #OR-GP17a Ioor General Purpose cachet #OR-GP17a on blank cover Ioor General Purpose cachet #OR-GP17a on blank cover
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  18. #OR-GP18 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Event, 5-30-1932
    Ioor General Purpose cachet #OR-GP18 Ioor General Purpose cachet #OR-GP18 Ioor General Purpose cachet #OR-GP18 on event cover
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  19. #OR-GP19 -- Dr. Harry C. Ioor General Purpose
          #893-851-GP32, 10-28-1940 XIV:7
          Patriotic: S2#11033 p. 394
          WW II, 9-23-1943, 1-08-1944 -- unused blank
    Ioor General Purpose cachet #OR-GP19 Ioor General Purpose cachet #OR-GP19 Ioor General Purpose cachet #OR-GP19 on event cover Ioor General Purpose cachet #OR-GP19 on event cover Ioor General Purpose cachet #OR-GP19 on blank cover
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  20. #OR-GP20 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Patriotic: S2#10965 p. 393
          WW II, 7-30-1945 -- unused blank
    Ioor General Purpose cachet #OR-GP20 Ioor General Purpose cachet #OR-GP20 Ioor General Purpose cachet #OR-GP20 on blank cover Ioor General Purpose cachet #OR-GP20 on blank cover
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  21. #OR-GP21 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Patriotic: S2#10804 p. 390, 11-04-1943, 8-06-1944
    Ioor General Purpose cachet #OR-GP21 Ioor General Purpose cachet #OR-GP21 Ioor General Purpose cachet #OR-GP21 Patriotic Ioor General Purpose cachet #OR-GP21 Patriotic
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  22. #OR-GP22 -- Dr. Harry C. Ioor General Purpose
          #720b-NIP, 7-25-1932
    Ioor General Purpose cachet #OR-GP22 Ioor General Purpose cachet #OR-GP22 U.S. Scott #720b-NIP - Ioor General Purpose cachet #OR-GP22
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  23. #OR-GP23 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          I cannot find a cover with this design.
    Ioor General Purpose cachet #OR-GP23
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  24. #OR-GP24 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Patriotic: S2#10772 p. 390/397
    Ioor General Purpose cachet #OR-GP24 Ioor General Purpose cachet #OR-GP24 Ioor General Purpose cachet #OR-GP24, patriotic, Sherman 2nd ed. #10965 Ioor General Purpose cachet #OR-GP24, patriotic, Sherman 2nd ed. #10965 Ioor General Purpose cachet #OR-GP24, patriotic, Sherman 2nd ed. #10965
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  25. #OR-GP25 -- Dr. Harry C. Ioor General Purpose
          FDC, See: General Purpose GP#Eagle3
          See: General Purpose GP#Eagle3 for all varieties of this cachet I know about.
    Ioor General Purpose cachet #OR-GP25 Ioor General Purpose cachet GP#Eagle3a Ioor General Purpose cachet GP#Eagle3b Ioor General Purpose cachet GP#Eagle3c Ioor General Purpose cachet GP#Eagle3d Ioor General Purpose cachet GP#Eagle3e
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  26. #OR-GP26 -- Dr. Harry C. Ioor General Purpose
          #726-GP15, 2-12-1933 -- #804EE, 9-08-1941 -- #809EE, 10-28-1941 -- #808/822, 10-27-1938
          Patriotic: S2#10772 p. 390/397, with just the same flag and no text was identified by Lawrence Sherman as by Wesley Smith, not Ioor.
    Ioor General Purpose cachet #OR-GP26 Ioor General Purpose cachet #OR-GP26 Ioor General Purpose cachet #OR-GP26 Ioor General Purpose cachet #OR-GP26 Ioor General Purpose cachet #OR-GP26
    U.S. Scott #726-GP15 - Ioor General Purpose cachet #OR-GP26 U.S. Scott #804ee -- Ioor General Purpose cachet #OR-GP26 U.S. Scott #809ee -- Ioor General Purpose cachet #OR-GP26 U.S. Scott #808/822 -- Ioor General Purpose cachet #OR-GP26
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  27. #OR-GP27 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          I cannot find a cover with this design, without the bar as shown on #OR-GP14.
    Ioor General Purpose cachet #OR-GP27 Ioor General Purpose cachet #OR-GP14a Ioor General Purpose cachet #OR-GP14b
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  28. #OR-GP28 -- Dr. Harry C. Ioor General Purpose
          FDC, unknown
          Patriotic: S2#11008, p. 394
    Ioor General Purpose cachet #OR-GP28 Ioor General Purpose cachet #OR-GP28 Ioor General Purpose cachet #OR-GP28, patriotic, Sherman 2nd ed. #11008 Ioor General Purpose cachet #OR-GP28, patriotic, Sherman 2nd ed. #11008
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    29. Other Ioor General Purpose cachets not in the Catalog
  29. #OR-GP29 -- Dr. Harry C. Ioor General Purpose
          #724-GP4, 10-24-1932
          Patriotic: S2#8912, p. 344
    Ioor General Purpose cachet #OR-GP29 Ioor General Purpose cachet #OR-GP29 U.S. Scott #724 - Ioor General Purpose cachet #OR-GP29 Ioor General Purpose cachet #OR-GP29
  30. #OR-GP30 -- "First Day Cover" General Purpose
          FDC, unknown
    Ioor General Purpose cachet Ioor General Purpose cachet
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    Ioor Patriotics:
    A partial list of Ioor Patriotic cachets listed by Lawrence Sherman, 2nd ed..
  1. S2#680, p. 148 ("Armistice Day [Doughboy]") no scan
  2. S2#681, p. 148 ("Armistice Day [Gen. Foch]") no scan
  3. S2#682, p. 148 ("Armistice Day [Gen. Pershing]") no scan
  4. S2#990, p. 157
    Ioor General Purpose cachet
  5. S2#2656, p. 197 -- #OR-GP12
  6. S2#2727, p. 202
    Ioor General Purpose cachet S2#2727 Ioor General Purpose cachet S2#2727
  7. S2#3033, p. 207 -- #OR-GP12
  8. S2#4743, p. 248
    Ioor General Purpose cachet S2#4743
  9. S2#8912, p. 344 -- #OR-GP29
  10. S2#10772, p. 390/397 -- #OR-GP13 -- #OR-GP14 -- #OR-GP15 -- #OR-GP26 -- ^^Flag, U.S., billowing, with 2 tassels
  11. S2#10774, p. 390 -- ^^Flag, U.S., being raised, 1 figure raising flag, 2 saluting
    Ioor General Purpose cachet S2#10774 Ioor General Purpose cachet S2#10774
  12. S2#10775, p. 390 -- #OR-GP8a -- ^^Flag, U.S., billowing in front of "Spirit of 76"
  13. S2#10776, p. 390 -- ^Flag, U.S., billowing in front of staff
  14. S2#10804, p. 390 -- #OR-GP21
  15. S2#10891, p. 392/397 -- #OR-GP17
  16. S2#10940, p. 393
    Ioor General Purpose cachet S2#10940 Ioor General Purpose cachet S2#10940
  17. S2#10944, p. 393 -- #OR-GP8
  18. S2#10965, p. 393 -- #OR-GP20
  19. S2#11008, p. 394 -- #OR-GP28
  20. S2#11033, p. 394 -- #OR-GP19
  21. NIS2#210a, p. 140 -- Abraham Lincoln / 1809 - 1865 / From / Log Cabin / to / White House
    Ioor General Purpose cachet NIS2#210a (not listed)
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What's New on this page -- changes since 12-03-2025:
12-11-2025 -- Added: #OR-GP10 cover scan
#Contact
URL: https://folklib.net/fdc/makers/gp-ioor.shtml
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Page created by Douglas H. Henkle (Contact): henkle@pobox.com