Tom: this is a 1947 .410 Field with righteous colors. When did the cyanide process start?
Drew - I don't have a date; but based on my Charles Jarred research the change took place very early during the Marlin era. Remember he began work there as a helper in the hardening department; and it was an accident with cyanide that left him temporarily blind. It was only after he was able to return to work that he became an apprentice in the engraving shop. As regards Marlin's hardening process, it took a while to perfect their hardening process; and early on guns were being shipped with brittle frames that were cracking with use. I failed to mention that fact earlier; but these cracked frames were the primary reason that Marlin era guns received bad press.