All working lovely military WW2. Solid silver case, not chromed. No more info, let you do the work! ; )
Here is a link to MWR forums where I posted the question of a silver-cased A-11. Several members replied they had silver cased models, with silver crowns too-just like mine.
http://www.mwrforum.net/forums/showthread.php?p=178112
I have seen several siver cased models for sale since my post, so they are not all that rare, below is a pic of one, seller deals mainly in vintage US military watches, and states the case is sterling silver, note the dark silver tarnish at the top of the lugs.
Here is a pic of a silver cased one, note it has been left uncleaned and is totally covered in tarnish.
Just wanted to clear that up with solid proof, as several members thought it was a myth.
Thanks! so it is silver, I've also seen on this site and others, cases that are two piece ones with some other, possibly brass or base metal.
If you think it is not silver still, You state in the above post this document was first printed in Jan. 1945, and this watch dates to 1943, both the case and movement.
Don't forget sterling silver was used extensively in watch case manufacture throughout the war years, as nickel and brass were at a premium.