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 1202, plate number 27263

The "Plate Number Single of the Month" for March is Scott 1202, the 4¢ Sam Rayburn stamp issued in 1962. Until the passage of the 20th Amendment in 1933, newly elected members of Congress were sworn in by the Speakef of the House on March 4th. While three other Speakers of the House (Henry Clay, James K. Polk, Howell Cobb) have appeared on U.S. stamps they were honored for other achievements. Sam Rayburn is the only one specifically honored for his long tenure as Speaker of the House.

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 March 2, 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.