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If one is to believe the inter webs, the serial number dates it to circa 1923. I think it looks badass, your project doesn’t involve explosives or steampunk does it?
Perhaps I'm reading it wrong, but I am seeing 8.6M on the movement and 8.8M on the case, which is probably early-30s, or maybe closer to the middle of the decade. You need to be careful reading those charts as well, since the standard ones have some notorious typos, where years are transposed from line to line.
This PW is not only authentic, but in very nice condition, and should not be part of any project that involves modification.
Jim’s post was a PM to me to point out that you can actually see the end of the 37.5L marked under the balance! He was too polite to correct me on the thread.
Well done Jim: quite right, it must be a 37.5L. I think we’re agreed on the other details.
Hope that helps Erik.