Anyone know anything about watches made from WWII Planes?

My Grandfather gave me a watch that was my Grandmothers. She worked on the military base during the war, and he said that at the time there were thousands of men who worked on the military bases, but only a few females, and because of this she was always receiving hand made trinkets from the soldiers, this watch being her favorite. This watch has a metal band, and says "Manila luzon" on the band, and on two hearts it says "Dottie 1945" (her name was Dorthy). Its a wind watch, and the brand is Elbon. It looks as if "Manila Luzon" was engraved by a professional, and her name and year was engraved by the soldier. My grandfather said that it was made of parts from an old WWII plane. Im thinking perhaps the soldier made it, or he purchased it like this, im not sure. Does anyone know any other information about these kind of watches, or know if this could have any value to it?