I do not know how to age based on serial number. No info I can find. It is used but I have never fired it. They where produced form 1963 to 1979. Diamond Gunsmithing could most likely date it. He used to work for the old Ithaca Factory.
I have never seen one with the "silver" receiver. Do you know if it came that way or did someone do a custom job on it? I used to have the 20 Gauge version years ago and sure would like to have one in 410.