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pedals are a replacement
originals were Atom model 440
one time they ran out and used the KKT RTSF as a substitute for half a year
do not recognise these; perhaps they are a model of Union. there is likely a marking on the endcap. the Union mark is a letter U inside a shield shape:
note that the chainset exhibits the Schwinn specific shift smoothing ring to aid upshifts from the small to large chainwheel.
here is one on a 1971 model ST:
[ the 1971 model ST came with a TA chainset while subsequent years received a NERVAR]
appears to be a 1972 model. 1971 was the launch year. the 1971 had a T.A. chainset and by 1973 the rear mech had become a Schwinn badged Shimano Crane.
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