FYI - its a takedown model. I don't know if they all were. If not they seem to be common - I have seen a few and they were all takedowns.
I have been through four of these from 1972-1975. I don't believe the take-down models came along until 76 or possibly as late as 78.
That is simply wrong.
I have owned several first year guns after buyng my first one almost 40 and the guns were all the same.
They never changed the design. From the beginning ,the guns a had the same basic design with the takedown screw at the rear of the action just above the trigger. Pull that screw and the gun comes apart in two halves.