1944 Waltham WWII Air Force Military 10 Sec Timer, 16s, 7j, Grade Timer Model Military Pocket Watch Serial No. 31923207 with Black Signed 10 Second Dial in a Keystone Base Metal Case with US Air Force Engraving and age/use appropriate patina. The Black 10 Sec Dial has age and use appropriate patina and the Movement is very clean. This will make a wonderful addition to any Military Pocket Watch Collection. See my other auctions for more beautiful pocket watches and other unique and quality estate sale finds. I only have main springs replaced if they are broken to ensure they do run, but don’t necessarily keep perfect time.