I got this watch a couple of years ago but I don't know it's history at all. When I took pictures to post here, I realized that it is Schaffhausen (with my eyes, even with my reading glasses, I couldn't read its mark ).
Please tell me where I should look at to find out what model this is and when this watch was made. The cover behind the watch shows neither marks nor number.
Thank you for your advice in advance.