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Poor man's Pasadena (alias LeJour) - part needed

Hi guys

I need a replacement o-ring for the back of my 7750 LeJour chrono. I opened the back to look for the rattle (worn autowind weight bearing I think), and the o-ring disintegrated. I got all the bits out with some Rodico, but I'm not even sure where it was seated, so it's a little difficult to measure for it.

So - if any of the watchmaker types out there have one of these models, and are willing to open it and see where the o-ring sits, I'd sure appreciate it. Even better, if you have the specs for the o-ring that would be super.

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