Hr serial number dating

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The Waltham Watch Company complied immediately with the requirements of Ball's guidelines, later followed by Elgin Watch Company and most of the other American manufacturers, later on joined by some Swiss Watch Manufacturers.

They use these documents as a reference and the documents should be limited to that use.However, dating a carbine by it's serial number alone is difficult and not always accurate given the circumstances inherent with manufacturing and the logistics situation during the time the carbines were manufactured.A few of the manufacturers at various times used subcontractors to manufacture their receivers.As solutions to old problems were learned, some of the same receivers were brought back online and completed (i.e.Winchester receivers initially rejected because of an off spec deep hole drilled for the recoil spring and guide, later recovered and altered to use a detachable main spring housing).

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