Marlin 80 without a letter suffix was made between 1934-1939. www.countrygunsmith.net
Which model, serial? if after 1920 check the date code stamped on the barrel. Remington Society of America, Manufactured Date link has the details.
Serial? 1909 to 1938ish From 1921 on they are date code stamped on the barrel. Check the Manufactured Date page on the Remington Society of America.
1924 - it will be date code stamped on the barrel, see related links for information on the Remington Society of America.
There should be a stamped model number on the left side of your barrel. The serial number will be on the reciever; however, the model number is on the barrel.
model stamped inside cylinder housing near barrel.
1924 - Will have date code stamped on the barrel. See Manufactured Date on the Remington Society of America for details.
check the date code stamped on the barrel. Remington Society of America, Manufactured Date link has the details.
1928, barrel date code stamped. See Remington Society of America, manufactured date page.
Check the date code stamped on the barrel. Remington Society of America, Manufactured Date link has the details.
check the date code stamped on the barrel. Remington Society of America, Manufactured Date link has the details.
1930 - it's date code stamped on the barrel see related links for information on the Remington Society of America.
Check the date code stamped on the barrel. Look for the manufactured date link on the Remington Society of America for details.