You can call Remington Firearms at 1-800-243-9700. Listen to the prompts an it will give you a representative that can tell you the age of the gun by serial number
The letter I think
1921 and on they are marked with a barrel code you can look up on the manufactured link on the Remington Society of America, before that need a serial no to tell and then only a year and not the month/year that the code provides.
Send the info to Remington Arms via email. They will get back with you in a day or so. There is no published list of mfg dates for Remington.
You can contact Remington directly,and use the customer service site to E-mail your shotguns serial number and letter code found on the barrel.They will contact you with the year of production.
They have date code stamps on the barrel which can be looked up on the manufacture date link on the Remington Society of America. --- Update: It's important to note that the barrel on the shotgun MAY not be the barrel that was originally on the shotgun at purchase. Check the serial number with Remington.
What is year of manufacture of a Browning Shotgun A-5 with serial number 01553NP111?
1915
Your question cannot be answered without you providing the name of the maker of your shotgun,and then we can determine if there is any public data to identify the year of manufacture.
Since 1921 Remington has date stamped the barrel you can find the details/table on the Remington Society of America under the Manufactured Date link.
It's date stamped, check the manufacture date page on the Remington Society of America for details.
1909 - first year
1985 is the year this was made