Cut it down and count the rings. No, wait! That's for a tree. Try this: Start with all the information that is printed on the gun. There should be a manufacturer's name or trade name on it. It may also have a model number, serial number, or proof marks. Take all this information to the library and find Flayderman's Guide to Antique American Arms, Gun Trader's Guide, and The Blue Book of Gun Values. Look through these books and all the others on the nearby shelves until you find your gun. You may be able to find an exact year of manufacture if it is by one of the major makers, but most likely you will have to settle for an approximate date based on the dates the manufacturer was in business or made a certain model.
you can find that info at proofhouse.com
Find someone who reloads shotgun shells. They will relieve you of your inventory.
You lick it.
gun show, gun shop
You will have to call Browning with the serial number to find out.
Old catalogs, old gun books.
Where can i find info on a Reno Shotgun
If it was made for Browning you can tell by the serial number.
THIS Glenfield MOD 50 BOLT ACTION SHOTGUN WAS MANUFACTURED 1966-1972. I HAVE ONE AND ALSO CANNOT LOCATE THE SERIAL NUMBER.
The serial of you Parker shotgun did not print in your question. But to find a date by serial number, there is a Parker Gun collector website that has a list of serial #'s and date of manufacture. The website is : http://www.parkerguns.org/
Hold it a little closer to your computer so I can see what it is.
You will have to contact Miroku to find out.