My guess is that the DH is the date the gun was manufactured, September of 1939. The DH is in the general area where Remington stamped the code. Some of the date stamps are right against the lug and you really have to look close to see the stamp. If the gun was returned to Remington for service, the stamp would read DH3 (3 meaning returned for service in Sept of 39). This service stamp would be found on Meriden Parkers also when repaired by Remington.
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