BULOVA Pendant (Necklace) Watch Clear Back See works

My Husband and I went through some rough times when we were young & pawned a few family heirlooms to get by. One of which is a watch pendant (necklace) owned by my grandmother that my father used to play with when he was an infant. We now have an infant of our own and think he would truely enjoy this watch. It was a BULOVA watch about an inch wide, completly round with a clear magnified back so you could see the works of the watch. 1920's -1940's era