http://remingtonsociety.com/rsa/questions/barrelcodes
For date markings, the forums on the site for others.
http://remingtonsociety.com/rsa/questions/barrelcodes or try the forums and ask.
You can find Remington Date of Manufacture codes at www.rimfirecentral.com in Remington Forum
Find an authorized Remington Repair center. You can find a list on Remington's web site.
Does not exist.
Please list all the markings on the firearm so we can properly identify it. sales@countrygunsmith.net
Provide a list of all markings.
Remington Society of America, there is a link for manufacture dates link which will explain the date codes.
Can't be determined from the markings you list.
Remington did not produce a .410 side-by-side, except in the Parker. Please list ALL the markings on the gun, exactly as they are on the gun. sales@countrygunsmith.net
Assuming your Model 11 Remington is a shotgun. Remington doesn't date firearms by serial number. Receivers (which have serial numbers) are made during one specific time. Later, at some point the receiver is assembled into a complete gun. Remington, for some reason chooses to use "date codes" that are stamped on the shotgun barrel, so assuming the barrel is the original barrel to that firearm, the date code on the barrel holds the key to when that shotgun became an assembled firearm. Actually serial list/dates do exist ;) They are online at the Remington Society of America in the part of the Remington factory log book including model 11's, from my quick list this is a very late shotgun after 1931 (where my quick serial list ends). There is also the date code table there, please see related links.
No where I'm aware of online, I have a list ;) If it's made 1921 or later it's barrel code dated link added for details.
Many Remington firearms may be dated by the letter code stamped on the barrel. This combination of 2 or 3 letters is rather small, and is stamped on the barrel on the LEFT side, at the very rear of the barrel. You may need a magnifier and a bright light. Once you find the letters, go to the link at the bottom of this page to decipher the date made. Good luck!