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- Classic U.S. Stamps
- 19th Century
- 20th Century
- 1900sScott 294-373
- 1910sScott 374-547
- 1920sScott 548-681
- 1930sScott 682-858
- 1940sScott 859-902
- One-of-a-Kind Stamps
- Bargain Stamps
- Modern U.S. Stamps
- 20th Century
- 1940sScott 903-986
- 1950sScott 987-1138
- 1960sScott 1139-1386
- 1970sScott 1387-1802
- 1980sScott 1803-2438
- 1990sScott 2439-3369
- 21st Century
- 20th Century
- Back-of-Book
- Semi-Postal (B)
- Complete Booklets (BK and BKC)
- Air Mail (C)
- Air Mail Special Delivery (CE)
- Special Delivery (E)
- Registration (F)
- Certified Mail (FA)
- Postage Due (J)
- Shanghai’s (K)
- Officials (O)
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- Scott O1-O9Agriculture
1873 - Scott O10-O14Executive
1873 - Scott O15-O24Interior
1873 - Scott O25-O34Justice
1873 - Scott O35-O45Navy
1873 - Scott O47-O56Post Office
1873 - Scott O57-O71State
1873 - Scott O72-O82Treasury
1873 - Scott O83-O93War
1873 - Scott O94-O120Soft Paper
1879 - Scott O121-O126Postal Savings
1910 - Scott O127-O163Modern Officials
1983 to 2009
- Scott O1-O9Agriculture
- Parcel Post (Q)
- Parcel Post Postage Due (JQ)
- Special Handling (QE)
- Postal Insurance (QI)
- Hunting Permit (Duck Stamps) (RW)
- Junior Duck Stamps (JDS)
- Modern Imperforate Stamps
- Plate Blocks
- Plate Number Coils
Plate Number Coils
Similar to the plate blocks, the Bureau of Printing and Engraving used identification numbers on the bottom of coil stamps. Starting with Scott 1891, these numbers were intentionally left on the stamp. Prior to this, plate numbers were intentionally removed during the coiling process. Spacing between numbers varies between five and fifty-two stamps depending on the printer and which press was used. These are normally collected in strips of five with the plate number on the middle stamp. In cases where there is more than one design on an issue, the correct number of stamps for a proper plate numbered coil (PNC) can be up to twenty-one stamps as it is for Scott 3801a.
