1940's, 17 Jewel Gruen Precision W/ Working Alarm Function
I found this piece at a watch repair shop by my office (NYC) for only $50. Someone dropped it off and never came back for it. The dealer (who's worked on pieces from my collection for years) only charged me the labor cost he was owed. The Gruen Watch Company (1874-1953) has an interesting story but the pieces they built are hard to research and difficult to date their exact production year. After opening up the watch I can confirm that mine was built in the Precision factory in Bienne Switzerland sometime in the 1940's. Below are some pics for you.