ID on an Omega Speedmaster Bracelet

I am trying to ID a peedmaster Bracelet I have had for a long time. It is marked on the inside blade of the clasp No. 12 in an oval outline (with the Omega logo and Stainless Steel, and also 2-71 on one end of one of the blades. The Endpieces are 19mm and are only marked 77. Trying to find out what model it is. Looks like it was made in Second quarter 1971, I think. Any help would be appreciated!

thank you so much!

This isn’t a 1125, but it’s a common mixup.

It’s a US made bracelet (I believe) that is essentially a cross between the 1069 and 1175. Essentially a 1069 style link but without the design running through the center. The trick to differentiating this from a 1125 is the width of the center link, which is wider on the 1069/1175 than it is on the 1125.

These curved variants usually pop up with 77/78 endlinks on various models in the 70s, but not really speedmasters.

77/78/48/49/640 endlinks work with these, but don’t work on the 1171 or 1125.

The 1125 is essentially a 19mm version of the 1171 which has totally different endlinks.

This should help:

1175, 1069, and hybrid bracelet.