Not disagreeing... but the watch has been serviced before,
IF this is what we assume led to the switch between the original 2998 case back, and the current 2915 one.
Isn't that a potential indication that it happened at a time when 2915 and 2998 were cohabiting, say late '50s or in the '60s? In turn, a redial could have taken place a long time ago and would have had a chance to age nicely...
Pure speculation but wondering....
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