Welcome to Gems for Friends! Here we have is a Vintage Sheffield Calendar Skin Diver Swiss Wristwatch. I believe the watch is missing it’s outside crown and as far with it functioning, I winded it a few notches but had to tap it a couple times for it to tick. So it will definitely need to be serviced, also the glass has a hair-line crack on the bottom area. The watch has its fair share of scratches and wear from age but nonetheless still a good fit for anyone who appreciates for what it is. If you need additional photos or have any questions please let me know and I’ll do my best to accommodate your request. As always enjoy the rest of your day and thank you for your time!