Many tens of thousands of products were manufactured by the various DeArmond companies over more than four decades. In order to verify the date of manufacture for guarantee purposes, some products had their production date (day, month and year) rubber-stamped internally during manufacture. These items included FH pickups and effects pedals
Other products, including some Model 1000 and 1100 Rhythm Chief pickups and ‘Hershey Bar’ pickups, had the same information rubber-stamped on their underside.
Some FH pickups had the last two digits of the year of manufacture stamped on the small metal tab normally covered by a black plastic sleeve. Some other FH pickups had the date stamped internally. The FH pickup’s cover can be removed easily with some care, as it is a push-fit and not soldered or glued in position during manufacture.
The Company name was also stamped on the underside of some products and while not as accurate as a precise date, this at least establishes a period. See Company History page for more information.