My grandfather recently passed away and left me the watch in the pictures. It's a Seamster purchased in 1955 in Switzerland, but I'm having difficulty determining the specific variation. I would appreciate any help you can offer in making a definitive ID. I intend to sell the watch, so need this information to list. If you have any thoughts on approximate value that would also be appreciated. Watch and strap are all original. Never restored. The watch runs and the case is in good condition, but probably needs service. I have the original booklet that came with the watch. Thank you in advance for your help.