https://en.wikipedia.org/wiki/Remington_Model_721

The Model 721 and Model 722 along with the later Model 725 variant are bolt- action sporting rifles manufactured by Remington Arms from 1948 until 1961.

https://www.gunvaluesboard.com/i-want-to-check-the-manufacturing-year-of-the-remington-721-sr89492-573445.html

That looks like a "D UU" date code. If those are the letters it was made in September 1949 (second year of production for this model). A couple things that jump ...

https://www.rc-trucks.org/remington-firearms-serial-numbers.htm

Where to look for the serial numbers on Remington guns and how to decode them. ... Remington 721 270 For Sale ... will see an example from a newer Remington 597 rifle with a manufacturing date of April 2006. ... This means that sometimes you will have to consider the specific model of Remington firearm that you have.

https://www.remingtonsociety.org/forums/viewtopic.php?t=410

Dec 18, 2004 ... Serial, Model-calibre, bbl code, date nnnnxx 725-270 A E 3/58. Feel free to post yours just like above. I will edit entries into this first post.

http://oldguns.net/sn_php/remdates.php

REMINGTON DATES OF MANUFACTURE For Remington guns made 1921- 1972 only. We have no data for Remingtons made at other times. A two or three ...

https://ingenieriareal.com/dating-remington-721/

Oct 28, 2018 ... Dating remington 721 - If you are a middle-aged woman looking to have a ... These serial number lookup page of manufacture dates model 700 ...

https://www.remington.com/support/safety-center/safety-modification-program/remington-model-721-722

If you own a Remington Model 721 or 722 rifle: All Remington Model 721 and 722 rifles were manufactured with a bolt-lock mechanism. These models were ...

https://www.shootersforum.com/rifles-rifle-cartridges/40562-remington-serial-numbers.html

Aug 29, 2007 ... Remington Year of Manufacture Codes maybe found on the barrel of your Remington ..... Pre 1921 Remington Model 11A manufacturing Date ...

https://www.answers.com/Q/Date_of_manufacture_Remington_model_721_serial_number_31533

You can not date the gun by the serial number. There is a one or 2 digit code stamped on the left side of the barrel right next ti where it joins the reciever, That ...

https://www.leeroysramblings.com/Gun%20Articles/remington_barrel_date_code.html

Jun 18, 2017 ... BARREL DATE CODE - stamped exposed on LH top rear of barrel after 1920 ... REMINGTON MANUFACTURING DATE CODE .... to go to the Blue Book of Gun Values, which does give manufacturing dates of most models.