CROWN WWI military windup watch with unique case braclt

CROWN U.S.A. largish cushion shaped military windup watch from the late WWI era- the watch is not working, as it needs a thorough revision and clean. The winding section is jammed, and I do not want to push my luck...:) This is a lovely example of a wirelug watch converted at some point into lugs, but as you can see, the style was a little way off, the bracelet is from the 1950's. The dial is lovely, and seems in good shape-barring a few tarnished portions/ the dial cleaning is required, and the caseback reads 'Keystone- Silveroid' Could be silver plated. The movement is definitely Swiss made, and the watch seems to be a U.S. Army officer's time piece, although there are no Military markings it prevails from the era of the end of WWI. or early 1920's. Measures- 30,0 mm in diameter, not inclusive of the fairly large onion shaped crown, 39,0 mm lug to lug, and 11,0 mm thick. The crystal is mineral, and was probable a replacement. Cheers!