Please help establish the vintage of the following: Record rear derailleur, chrome plated, all steel, says patent Campagnolo, no date; Record (or NR) front derailleur,aluminum body with an integral cable stop on the bottom, cage like early NR; Record clamp on shifters, the levers are thin without the extra material near the pivot point; NR cranks with a raised boss around the hole for the pedal spindle, say only 170 strada; cahinrings 54/47 (wow) Thanks, Rodney Handsfield (Las Vegas)