Which speedmaster ? Which speedmaster moon?

Here is a quick summary of the speedmaster reference #'s through 1978:
https://speedmaster101.com/serial-quick-reference-to-78/

Take those ref #'s and look them up here in this awesome thread detailing the original bracelet and endlink confirguations offered by Omega for the various reference #'s
https://omegaforums.net/threads/case-bracelet-endpiece-list.81618/

If you're looking for more modern Speedmaster reference numbers w/ the 1171 you'll have to do some legwork. Shouldn't be too hard to find on here.

I don't think that was matched to a Speedmaster. The 1171 fitted to the Speedy Pro used and still uses the 20mm 633 end link. The 625 is 22mm so if it was for a Speedmaster, it wasn't a Moonwatch, more like one of the Mk Series. Or some other Omega altogether. The 625s normally came on the 1170 bracelet so you may in fact have mismatched bracelet and and links.