I found this old Girard Perregaux Chronograph watch in a box filled with a variety of old watches. Any information on this watch would be greatly appreciated. The only thing I could find was a photo of a 1950's Brequet Type XX Pilot Watch that looked identical to this...the only difference was the name on the watch. Was this something that was commonly done in the 50's...two watch manufacturers producing identical watches? Thanks in advance for your help!