bikehomero
·I don't think the 1125 was equipped from stock for Speedmasters, but more commonly on Seamasters. It however looks and measures exactly like the 1171 in the vintage version, and probably the same for the modern version as well.
Is it really like that? If so, the bracelets would be interchangeable. You could use a 1171 with 617 endlinks for a FOIS, or a 1125 with 633 for a Speedmaster Professional.
BTW: FOIS looks great with the 1125!