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 2616 var, plate number 1

The "Plate Number Single of the Month" for May is a variety of Scott 2616, the 29¢ stamp honoring the World Columbian Stamp Exposition held in Chicago in May 1992. In the variety shown, the "a" in May is malformed, making it look like "Mzy". This year, May also features the Boston 2026 stamp show -- stop by the APNSS booth in the Americas section, "Mzy" 23-30, 2026.

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 May 7, 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.