1943 Hamilton Secometer
The watch is engraved Christmas TWA 1943 on the back and I'm assuming it was issued/gifted to civilian pilots during WWII since TWA was responsible for transporting military personnel during the war. (Since it's from WWII I thought it would look pretty sharp with a Hamilton military strap)
"(Howard) Hughes gained a controlling interest in 1941 and eventually controlled 78 percent of TWA. The airline prospered during World War II, racking up 40 million miles in flights for the Army, as well as supplying the North Atlantic route to Prestwick, Scotland, and the South Atlantic route from Brazil to Liberia and points east." **from Wikipedia.