I just got my hands on an old model 39 with an octagon barrel, ser#7266. Can't find any website to identify the year it was manufactured. I came across "Shooters Forum" in my search. Can anyone help?

I suggest you contact Marlin.

http://www.marlinfirearms.com/About/ContactUs.aspx

Bye
Jack

Welcome to the forum.

Have you checked out oldguns.net yet?

Go over to rimfire central. There are a few over there who have all the info you need on any 39's made.

http://www.rimfirecentral.com/forums/index.php

Just go to the Marlin section, and someone there can help you.