Assistance in Dating Hamilton Pocket watch

[macio]

I would like to know if anyone could help me with a Hamilton pocket watch given to me by my Father. This is what I know 5 positions, 21 jewels, 921, H13910 on the movement inside the watch is where all these fiqures came from. On the hinged dust cover back of watch wadswerth H408691, Lancaster PA. I am trying to find out the size of this watch and the possible date if anyone could assist me. I am currently living in Okinawa Japan and any type of information about an American pocket watch is limited at best. Thank you.

[RON in PA]

Your Hamilton 921 is a size 10 PW that was made in the 1939-1940 era. Approximately 54,000 model 921 watches between 1936 and 1956.

[macio]

Thanks for the swift and informative response about my pocket watch