Case clamp for Seamaster 2576 reference

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That pretty much sums it up. I need a case clamp for a 2576 reference Seamaster which houses a 344/342 bumper movement. I believe it may be the same clamp as used in the 2577 reference? Not positive on that - any guidance would be appreciated.

Let me know if you have any lying around!

Here’s an example taken from an old @MSNWatch FS listing.

 
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I needed one several years ago, and I guess I never did find the right place. So I ended up fabricating one.
 
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I’ve seen those, but I believe the correct clamp should have a step in it and those don’t..