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 R733, plate number 168108

The "Plate Number Single of the Month" for April is Scott R733, the 10¢ Documentary commemorative issued in 1962 in honor of the 100th anniversary of the founding of the Internal Revenue Service. It was reissued the following year without the "Established 1862" as the final Documentary revenue stamp Scott R734.

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.

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

Last updated April 1, 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.