Yep, as others have said, a valuble and very sought after 145.022-69 Speedmaster. All parts (case, dial, bezel, bracelet etc) appear original with the exception of the central chronograph hand.
A sympathetic service by an independent watchmaker is essential to preserve originality. As you have already hinted at, Omega will end up replacing a lot of parts, ruining the history and originality.
Speedmaster101.net has a wealth of info of the individual vintage models.
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