Omega 20mm Speedmaster flat link bracelet 0020STZ015403. I don’t see any marks of note on the bracelet or clasp. I thought I’d take a shot and that it would fit on a First Omega in Space, like a Forstner or Uncle Straps, but it does not. (19mm ends and the first link of these flares out a bit.) Includes the original links, which are 20mm and - I’m told - fits a Snoopy with included links (3861) or the Uncle Seiko, which are in my photos. (On the bracelet, not the links in the bag). $545 with Uncle Straps standard Speedmaster ends. $525 with original 57 ends, which, again, I’m told fit the 3861.