The series of 10 postage stamps are existing perforated/gummed and imperforated/without gum. The imperforated stamps are also known as Farley's Follies. The Glacier National Park and Yosemite National Park stamps are also existing imperforated/gummed in miniaturesheet of 6 stamps. The Great Smoky Mountains stamp was reissued in 1937 as souvenirsheet imperforated/gummed and blue/green.
Farley's Follies, wikipedia reads:
James Farley (Postmaster General simultaneously under the first two administrations of President Franklin D. Roosevelt) is remembered among stamp collectors for two things. One is a series of souvenir sheets that were issued at commemorative events and which bore his name as the authorizer. The other are twenty stamps known as "Farley's Follies". These were preprints, mostly imperforated and ungummed, of stamps of the period, that Farley bought at face value out of his own pocket and gave to President Roosevelt and Interior Secretary Harold Ickes, both collectors, as well to members of his family and special friends of the Administration. (Farley himself did not collect stamps.) Unfortunately, some of these reached the market, offered at the high prices commanded by rarities. When ordinary stamp collectors learned of this, they lodged strenuous protests, newspaper editorials leveled charges of corruption and a heated Congressional investigation ensued. Finally, in 1935 many more stamps of these unfinished stamps were produced and made generally available to collectors at their face value.
Today the souvenir sheets and single cutout reprints are not scarce. The original sheets were autographed to distinguish them from the reprints, and fifteen of them were displayed in an exhibit at the Smithsonian's National Postal Museum in June 2009.
For more details please read Farley's Follies (wikipedia).
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