I found this watch with a box of antique jewerly from my relatives. It is working, I have not checked to see how well it keeps time. I was wondering how old it might be. It is a Gruen precision seventeen jewled veri-thin watch. The serial number looks like 129966?? The inside of the case says Cased and timed in USA by Gruen Watch Co. 14K Gold 117541. There are other engravings that look like numbers(very small hard to read). . The outer case has four diamonds and gold engraving. Any info anyone has would be greatly appreciated. I had trouble putting pictures on, if you want to see it I will try again.