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You can find Remington Date of Manufacture codes at www.rimfirecentral.com in Remington Forum
Please check the link for the Manufacture Date codes details on the Remington Society of America.
Remington Works - 1914 (late)
It's date stamped, check the manufacture date page on the Remington Society of America for details.
1915
1920
Need to check the barrel date code. Remington Society of America, Manufacture date link has all the details.
Remington Arms is in fact the largest US producer of shotguns and firearms. They manufacture and sell arms to both the military and to civilians from various resellers and retailers.
Remington Society of America: http://remingtonsociety.com/rsa/questions/barrelcodes
1920
1943
A link to the manufacture date tables by serial can be found on the Remington Society of America on this page. http://www.remingtonsociety.com/rsa/questions/barrelcodes 1942