It's more complicated than that. There is very detailed and specific information about this in the Moonwatch Only book. And if you search previous threads, you will find many discussions. Just going off the top of my head, the transition was in the 30.5 million range, but there was an overlapping range of serial numbers where both bezels were used. Moreover, not all replacements are the same. A replacement might be a much later service replacement with negligible value, or it may be another bezel that was swapped by a seller. Some replacement bezels (like a legit DNN) have some significant value. I suggest you show photos of the specific watch you are considering, or do more research. People get burned on bezels all the time.
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