The American Plate Number Single Society

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Welcome to the official web site of the American Plate Number Single Society. APNSS is a volunteer-run association of stamp collectors organized to promote interest in plate number singles and other marginal markings.

To join APNSS or request an application form, click here or email the Secretary at:

Click on the links to the left to navigate around the web site. These links appear on each web page.

 

Plate Number Single of the Month:

Scott 834a red brown and black, plate number F22168

The "Plate Number Single of the Month" for August is the $5 Fifth Bureau or Presidential Series stamp featuring Calvin Coolidge. BEP treated the high value Prexies such as the $5 Coolidge like currency, so they were printed in two colors via the traditional flat plate method, one for the black vignette and one for the frame. The plate was engraved with TOP in both colors to prevent inverts, and with the $5.00 denomination in both colors to prevent inadverently printing the Coolidge frame coupled with the $1 Wilson or $2 Harding vignette.

The regular printings were in carmine and black, but when a reprint was required during WW2 carmine ink was difficult to come by, so a short print run was done in red brown with black plate numbers F22166-67 and carmine (now red brown) plate numbers F22168-69. The different shade has been assigned Scott 834a and is considerably rarer (and more expensive) than the already-pricey carmine PNS -- in fact, one auction firm states that only about a dozen plate blocks of Scott 834a are known. The Scott editors caution that the carmine ink is easily chemically altered to produce red brown, so expertization with a certificate is recommended.

Click here or on View Examples on any APNSS web page to view examples of plate number singles over the years, as well as PNS of special issues such as airmail, parcel post and revenue stamps and proofs.

Flag Counter

The flag counter replaces an earlier counter which logged nearly 30,000 visits.

 

Last updated August 3, 2026.

APNSS is Affiliate #178 of the American Philatelic Society.

 

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Scott C13, plate number 20079

 

Opinions expressed by authors are their own and do not necessarily reflect those of the APNSS, its officers or members.