Frankly I'm surprised how many tried to help you out given the appalling quality of the photos you posted. Seriously, help the members here to help you by posting decent high resolution photos, and include the front, back and sides of the watch as well as the whole bracelet, not just the inside of the clasp. Currently it feels like some kind of test on a reality TV show. Finally, you don't need to get it overhauled to have the case back opened, just a half decent watchmaker, and a wealth of information lies within.
Irrespective, you are likely after something within the range of these two if you want to keep the watch original and accurate:
https://www.ebay.com/itm/282574949579 Purchases made through these links may earn this site a commission from the eBay Partner Network
https://www.ebay.com/itm/122622013121 Purchases made through these links may earn this site a commission from the eBay Partner NetworkClick to expand...