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Dupont manufacture date

Abeck
in Power Hammers, Treadle Hammers, Olivers

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Does anyone know how to figure the orginal date of manufacture for a dupont model a hammer with a serial number of 1825? It has Barbour Stockwell serial number tags and a Fairbanks type pass through hole behind the ram so I'm guessing it's relatively modern as far as the evolution of dupont hammers went. That said I don't know much about it, is there any info on it in the "pounding out the profit" power hammer book?
Just curious about the date, functionally it is irrelevant.
Thanks
Aaron

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