Here's a vintage Omega 7912 Flat Link Bracelet with #6 End Links that can fit many different Omegas, including Speedmasters, Seamasters and Railmasters.
The bracelet is dated 2/64.
This 7912 is approximately 6 1/4 inches from end to end. It has double-notch number 6 end links.
This is unpolished and unmolested. There are scuffs and scratches, as you'd expect a few dings also. If you need more photos, please let me know. One side of the bracelet has three stretch links, the other has none.