Originally posted by Hoff
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The comparison made was because both are using the same case design which was the Bettarini case (historic models) while the 423 is using the 47mm 1950 case (contemporary models)
All of the old Bettarini case (historic models) have 300m water resistant which include both the solid and even the clear case back and all are screw down case back. So this new "Bettarini" case have to compromise on the level of water resistance even though it has a solid case back as its no longer screw down but snap on. So, yes. Changing from a screw down to snap on case back causes the great difference in water rating in this particular instance.
For the 423 with the 47mm 1950 case (contemporary models), the lower water resistant could due to the larger case with a clear case back even though it's screw down. Most of the 47mm 1950 cases which have either a plexiglass or clear case back, will have a 100m water resistant. Unless the submersibles which as the name suggest, will have a deeper water rating of 300m minimum like the 305.
For the 44mm 1950 case, there are some with 300m ratings and some with 100m rating depending on the models.
But this argument/discussion was purely on the changes of the original Bettarini case as it is one of the iconic case that makes Panerai what it is today.
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