I have your '72's twin, though mine has a cotterless crank. Bought it for $50, it had been hanging upside down in the PO's garage rafters for 30+ years... I left the Simplex gear on but I keep a close eye on it (especially the FD). Shifting was decent after I did some tweaking, not going to replace until the inevitable Delrin cracking starts. Ride-wise there's no doubt, these are great bikes.
