It's interesting, there were some discussions previously about this type of dial. For example here:
https://omegaforums.net/threads/speedmaster-service-dial-or-not.59114/
"MWO calls it the B4 rarely seen but not listed as a service dial as it makes that distinction on other dials."
It doesn't matter much to me as this was meant as a "daily wearer" type of watch. It's interesting how the patina and condition of the dial matches the rest of the watch perfectly. If it were changed out, it must have happened very early on!
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