Dave,
Your experience sounds consistent with common practice in talking machine factories a century and more ago. Minor changes in design were seldom cut and dried beginning with one serial number and consistently applied from that point onward.
Factory reworked machines wouldn't need a new serial number - - in fact, that would have only caused confusion.
Your on-site observation may possibly prompt someone here to begin collecting electronic scales!
George P.
Where to look up Edison serial numbers?
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