By the time the painted markers were introduced the watch should have been wearing a 564.
A 24,8xxxx serial could easily correlate with the introduction of painted markers.
Why (or how) anyone would swap a movement for one of pretty much the exact original timescale is anyone’s guess.
@zamthang
If you are able to, for this watch, I’d be tempted to gamble the submission fee and submit only the serial number for an extract to see if they come up with a different answer.
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