Sorry to jump on your thread Rick but I've always had a similar hope that the chrono hand on my 145-022-68 may have been original too.
I bought it from the original owner and he could only remember the back coming off once, while he stood in the watchmakers doorway keeping an anxious eye on his Speedy. Of course, there's a lot you can forget in 40+ years
I'm guessing the jury here will say replacement.
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