Well there's 3 types, 5 models, and at least 15 variations so it depends so anywhere from 1865 to 1935. Also which one and original condition also makes a HUGE difference.
Check the date code stamped on the barrel, details on the Remington Society of America manufactured date link.
I don't see dbl in Remington, if you mean the dbl in general when when referring to a Remington firearm that's double as in double barrel shotgun, derringer, etc.
Date code on barrel, check Remington Society of America - manufactured date link.
1925, 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, see the manufactured date link on the Remington Society of America.
The Remington Model 721 in .300 H&H was manufactured in 1948 with a 24" or 26" barrel.
They have date code stamps on the barrel which can be looked up on the manufacture date link on the Remington Society of America.
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.
Date code on barrel, check Remington Society of America - manufactured date link.
Date code on barrel, check Remington Society of America - manufactured date link.
Which ones? The barrel? That's a date code. Check Remington Society of America - manufactured date link.