Originally Posted by
T-Mar
I believe the last year for the Record rear derailleur was 1973. It never did have the patent date code, at least on any that I've seen. I keep forgetting that the very early 1970s Gd'I used the Record as one of the cost concessions. Only the Nuovo Record had the patent date code, and only from 1970 onwards.
Most manufacturers started moving from SL to SP around the 58-60 cm frame size. It would be nice to think that the transition range used SL with SP down tube and chain stays but that would be improbable on a production frame of this era. You could always try to determine SL vs. SP via the post size.
It should have the helical ridges in the steerer tube, though they can sometimes be hard to see on the older models, with the corrosion that typically occurs inside the steerer tube.
I can see the cost concessions - RD, seatpost, Nervar crank, Universal mid-model brake, non-Campy headset.
Seatpost design is the seatpin and clamping saddle-rail attachment. Certainly not lightweight. Measures differently in a couple of spots but none are 27.2.
And to correct an earlier statement - NO non-drive side top tube script
Giro 'd Italia