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 1208, plate number 27392

The "Plate Number Single of the Month" for June -- for Flag Day -- is the 5¢ Flag Over White House stamp of 1963, Scott 1208. The stamp violated UPU-agreed stamp design rules by not including the name of the issuing country (Britain was the only allowed exception, since they had issued the first postage stamps and instead included a portrait of the monarch). However, BEP designers apparently felt the flag image met that rule without having to add "U.S. Postage" or "USA" to the stamp design.

The stamp was issued both untagged and tagged. Known plate number varieties include Bureau precancels, local precancels, examples with pre-printing paper folds, misperfs, as well as a proof printed entirely in the blue-gray color.

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 June 17, 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.