Wanted for a project, Speedmaster Pro caseback

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Looking for a Speedy pro case back
Ideally 1969/70 but I’ll consider later or earlier.

For this particular project, used parts, even heavily used would be ideal but new will also work if I can get them cheap enough!
Cash waiting or Omega and Rolex parts if you prefer!
I’m in the UK but have done deals with most countries in the world.
Edited:
 
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Got a few bits, just need a caseback now so I’ve updated my wtb.