Originally Posted by Metacortex

I don't believe that Schwinn ever used the Crane GS on the Paramount, especially not the 1st gen version without a cable adjuster or with red (Bullseye?) pulleys. Also it appears that yours has lined lugs, which were discontinued effective 2/22/72 production according to a 1972 dealer "News Flash". The 1970 through '72 P15 came with a Campagnolo Gran Turismo derailleur. The Crane GS was a common dealer or owner upgrade for those at the time.