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Case Serial No.:
Here is an interesting one; movement dated 1941 and case dated 1942. Based on date combination, I believe this to be a 1942 Nighthawk, which based on available ads appears to have been renamed the Air Warden in early 1943. Lots of jeweler's marks and watch is keeping time. It appears to have had the hour hand replaced with the later style seen in Air Warden ads. 1941/42 Ads for the Nighthawk show the stick luminous with lumed numbers, which subject watch has.