any help would be appreciated, I've tried eBay. I couldn't find it on ofrei or cousins either. Where else can I try?
WatchCo / Abouttime did have some NOS links, so might be worth a try. See this earlier post: https://omegaforums.net/threads/doe...ga-bracelet-number-this-is.37685/#post-435218 Also, another eBay seller did have NOS 1175 parts some time ago - I will try to establish his name.
1175 is vintage, so the parts warehouses probably won't be of much use. keep an eye on the FS section here and ebay. they come up fairly frequently... though more often with #47 ends rather than 640s. Price, probably around $500 or less. 1125 on the other hand is a modern bracelet and (I think) still available.
1125 can go on either, depending on the end links, as far as I know. for 20mm, modern 633 ought to work, or 617 for the FOIS (and other 19mm references)