Definitely a tough call, as the case looks nice (is it an original?). Honestly, I would either keep it as-is, or try to swing both -- make two complete watches. If I had to pick just one, I would try build the watch around the movement and dial. But I would be prepared to wait a long time for a decent case. I suspect that would be easier than finding a good movement that is from the right model Speedmaster.
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