The oldest one I have is;
1965, outer cable stop with hole only, upper arm chrome plated brass alloy, end of cage blades rivetted, of course, before 1972 (or so) no circlip, no lip.
1968 outer cable stop with slot, aluminum alloy upper arm, the end of cage blades screw together.
The one, showing in ebay, is probably specially reissured for cable stop, or modified. The upper shat is way too long in comparison with 60's frame. And the circlip looks too thick, not normal production of mid to late 70's.
I have been amased by "Artistic" enginnering of Italian stuff, they make chages every lot when they produce.
KEN TODA, High Point, NC Spring is here??