Interesting topic, I've always assumed there is no link between serial, case reference, and dial/handset in the 30s/40s. Although it makes sense that factory techs might assemble the same exact configuration at least a few times in a row, I could just as easily see them doing whatever they want, with no rhyme or reason.
How are you defining same serial and same batch? Have you been documenting/researching this?
Aside from the archival pic configurations, I'm not sure how anyone could prove a factory configuration vs a combination that was made after it left the factory.
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