Good day Cajunsr,
My name is Phillegrec and my language is french so I am motsly on the french forum.
I have bought some 40 envelopes from the USS American NAVY and I found this one (see scan) with an FDC.
May I know what does it mean and for which purpose it was used because all I know is that an FDC is the First Day of Cover and not Firs Day in Commission ?
I will thank Mister Cajunsr and also the others who will be involved in this research.
I wish to all a nice Sunday.

bonsoir cousin phillegrec,

it is good to see you again on the 'anglais' forum. to answer your question, this is a 'commission' cover for the u.s. navy ship cancellation. most ships had an onboard post office so this cover was most likely processed by the ship's postal clerk. they are quite common and i have many in my collection. some are very rare. here is a link on the history of this ship, no longer in our navy, but that of turkey since 1995. that makes this cover one of more value. :

Link (http)

un bonne WE a vous.

amities,
cajunsr.