I have seen one EARLY 740 S/N 54,9XX that has a barrel date coded May of 1969, which apparently had been sent back to the factory and rebarreled with a original 740 barrel instead of a 742 which was in production at that time.
To find general manufacturing dates it may be best to go to the Blue Book of Gun Values, which does give manufacturing dates of most models.
(*) On 8/9/99, they stopped stamping the barrels with the date code.
They however continued to mark the date code on the end flap of the shipping box for shotgun barrels however.
For models without a serial number, we may be able to determine the age by the 2-3 letters that are stamped on the barrel.
If your firearm does have a serial number, if you will call or email us the serial number and model number we can determine the approximate age of your firearm.
REMINGTON MANUFACTURING DATE CODE stamped on LH top rear of barrel, 2 or 3 digit, (month first, year after) these will normally only be the last letters as seen below, The factory says all barrels are date code stamped, well I have found some that are not, or if they are, are so erratic stamping that trying to decipher them is impossible. Both were taken off Remington 760s, with the one on the left, a 30-06 that I bought new October 10, 1954. The one on the right again a 30-06, but with a shorter barrel that I made into a knock around quad rifle with pivot mounts.
Also, I recently acquired this rifle and do not have any idea of the value.
Remington never (*) used serial numbers to identify the date of manufacture of it's firearms, they however stamped a date code (spelled out below) by the first letter meaning the month and the last letter the year of manufacture. On the RH side of the barrel will be a Magnaflux, Remington proof & a test mark If a gun is returned to the factory as a fire damaged, or blown up firearm, the factory will stamp it as a prefix to their date code with a #4 on the barrel and return it un-repaired.
Also if there is a custom or aftermarket barrel installed it will not have these factory codes.
Confounding the issue a bit may be the fact that Remington Arms stamps their final inspector stamps and assembly (product) codes in the immediate area of the date codes.