WW2 Patriotics: First Day Covers Cachet Display Catalog
Although this website is focused on FDC’s, one section lists US World War 2 era Patriotic Cinderellas and links to illustrations and detail notes. Useful to anyone collecting WW2 era Poster stamps. Click on the image. Part of a long-time project of member Doug Henkle.
There is also a page covering FDC’s for the 1939 NY World’s Fair US Stamp (Scott #853)
Swiss Vignettes Catalog
“Vignetten der Schweiz” is the creation of one longtime collector of Poster Stamps of Switzerland, Ruud Dulmus. He says there are 35,000 Poster Stamps referenced here. Worthwhile browsing.
Facebook Groups
“Poster Stamp Collectors Club” is a Facebook group run by members of the PSCC, but open to the general public
“Faux Postage Stamps” is for collectors of more general ‘cinderellas’:
There are many other Facebook groups for every type of stamp collector.
Alphabetilately
“Alphabetilately” is a personal web site of the American collector William Senkus. His site contains much on cinderellas, and Poster Stamps in particular. His alphabetically organized site contains Poster Stamp articles under A, B, C, E, F, I, M, N, O, P, S, W, and Z–in other words almost every letter.
Senkus has scanned and created a nearly complete index of a now defunct Poster Stamp Bulletin from (1936-51).
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American Philatelic Society (APS)
“American Philatelic Society” is national club for all stamps collectors. The Poster Stamp Collectors Club is an affiliate group of the APS, Affilate #255.  The APS maintains a calendar of Philatelic Events for collectors which could be of interest to you.
The Christmas Seal and Charity Stamp Society (CS&CSS)
The “Christmas Seal and Charity Stamp Society“ is a significant collectors club, founded in 1931, with interests in common with many poster stamp collectors.
The Cinderella Stamp Club
The “Cinderella Stamp Club” is an APS Affiliate and considered by many to be the single most important Cinderella collectors’ group, founded in 1959 in London. A British club but with worldwide membership, the Cinderella Philatelist club journal is published quarterly. The mission statement for the club is “[Create an] Association of philatelists with interests in local, telegraph, fiscal, and bogus stamps, phantom issues, etc.“
The Ephemera Society of America (ESA)
The “Ephemera Society of America“ is an APS Affiliate and is a major collector group of ephemera in the United States, focused on paper collectibles of every kind, but including Cinderellas stamps and Poster Stamps. Promoter of a major annual ‘paper show’ and supporter of events compatible with the interests of many Poster Stamp collectors. The groups mission statement is “To cultivate and encourage interest in ephemera and the history identified with it.”
The Postal Label Study Group (PLSG)
The “Postal Label Study Group“ is a club organized around the collection of airmail etiquettes, postal labels of every sort, and kindred collectibles.
