What is the manufacture date of a Remington Model 12C serial number 410621?

Starting in 1921, Remington rifles are dated by a 2 or 3 LETTER code stamped on the left side of the barrel, about a half inch from the receiver. Not by the serial number. Search for Remington Collector's Association Date Codes, and you will find the table to decipher the letters for month and year of manufacture. They are small- a magnifier and bright light will help