Clasp is from 1037 beads of rice. Strap appears to be a 1035 (not sure)) https://omegaforums.net/threads/advice-on-bracelet-requested.9695/
Good luck. That looks just like the bracelet I have also with nothing but the no.12 on it. I have been looking for a link on and off for about a year now.
Ha. Me too. We can all pool our links off our short 1175 bracelets to form a long one we can all share. If we find one more poor soul searching for a link to join our band of currently unwearable bracelet club we could rotate this new bracelet on a quarterly basis. Yes I know
WatchCo / abouttime-ch have NOS spare links for your 1175 bracelets, at least Marcus did have a few days ago. See: http://www.ebay.co.uk/itm/5x-Omega-...2FHgWfYMd%2BAgbZg8aW0%3D&orig_cvip=true&rt=ncPurchases made through these links may earn this site a commission from the eBay Partner Network
And still available: http://www.ebay.co.uk/itm/5-x-Rare-...966230?hash=item1eacca6d16:g:gjoAAOSwvgdW4OFJPurchases made through these links may earn this site a commission from the eBay Partner Network
While this clasp may be the same as the 1037 clasp, it is the correct clasp for the short lived 1175. I have two, dated '69 and '74.
Yours is definitely a 1175. If you look at the first eBay link that I posted, which finished on 22 March, you'll see that the photographed links are flat, the same as yours. However, the current listing has different photographs, which appear to be 1171 or 1162 links, so either the photos or the description are wrong. Hopefully he has just uploaded the wrong pictures to the more recent sales listing and still has 1175 links available.