Vintage Waltham A-13A Military Aircraft Cockpit Clock 8-Day, Not Working For Sale

This clock doesn’t work, but I’m too scared to dig into it to find out why! Could be a simple fix but I don’t want to mess up the historical value. Very cool cockpit clock from the Korean War I believe. This clock is in amazing shape but doesn’t seem to wind up when you spin the dial. Hopefully this gets put in the hand of someone that can get it running as it should be. Thanks for taking a look and happy collecting!