Upper: Commissioning cover, USS V-6 Type F (Fancy) cancel provided by North Bay Stamp Club.
Lower: V-6 Type P (Provisional) cancel, 25 known copies.


First of forty-four submarines built at Mare Island Naval Shipyard. Authorized February 11, 1925 but keel laying delayed until 1927. Launched March 15, 1930; the first shipyard launching in nine years. With length of 349' and submerged displacement of 3,960 tons, the largest sub built at Mare Island until 1959. Armed with two 6" inch guns, V-6 was known as a (SC) Cruiser Submarine.
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