It's a reference 145.022-69 Speedmaster. This reference is probably the most common vintage Speedmaster reference. This example does have the "straight writing" case back, which is marginally more rare - however it's poor condition likely offsets any additional value that it might have had from the case back. Aside from the case back, it is no different than any other 145.022-69.
Straight back Speedmasters were produced from 1971-1974, and the serial on this watch points to 1971. I would consider it's condition as poor. I don't think the bracelet or the end-links are Omega, but the clasp appears to be. Even if the bracelet is Omega, it does not belong with this watch, so contributes nothing to value.
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