Absolutely fabulous, Paul, and welcome to Omega Forums. My vintage Speedy came with the same mystery bracelet with the same No. 12 mark on it but no other identifying information. The conclusion I cam to, with the help of this forum, was that it was an 1175. From what I understand the 1175 was specific to the 145.022-69 only, however, so that is a dead end as far as your watch goes. I am not an expert, but there are some folks here who are who hopefully will comment.
Congratulations again on this fine watch. I am honored to have been a part of your project's success.
Best regards,
Myron
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