I just received this as an inheritance from my Grandfather. It is a nice Lange but don't know much about it or how to find out info on such things as value for insurance or if it is even worth insuring. It is engraved with his initials inside the back case with the date 1897. Would the serial number help in determining its history? I've attached a photo for reference but can take others for closer detail. He also left me a
Tavannes? Picture shown as well