Remingtons manufactured after 1921 have a code located on the left side of the barre Can you determine the age and model variation of a Remington 700 from the serial number? If so, could someone point me to a source of this information. Additionally, what year was my Remington 742 made The following serial number information is for Remingtion firearms manufactured after 1921. Remington Model 700 Serial Number Lookup: Remington Firearms manufactured after 1921 have a code located on the left side of the barrel near the frame that identifies the year and month of manufacture.