Nuevo Record Derailleur Rear looks and works like new, but Dave Siskind had put over 17,700 miles on it. Nuevo Record Front Derailleur was given to me, unused, by a young racer who didn't want an old fashioned mech. when his friends all had the (then new) Super Record.
TA arms are 160mm, I like 'em short.
Outer ring is a middle ring mounted on a tandem connecting ring carrier.