I just purchased a 14k Tiffany & Co. wristwatch at auction. I wanted to open it up to see who made it, the number of jewels, etc., but there doesn't seem to be a way to get the back off. Could it be that it opens topside through the crystal or something? Anyway, I'm going to leave this to the watch man. The crown has what appears to be a "GP" on it--did Girard Perregaux make any watches for Tiffany & Co? If so, does anyone know an approximate time frame? Thanks so much from an uneducated collector!