Two more things strike me as odd about the eBay bike.

First, shouldn't it have brazed on cable guides? My '68 does and I would have thought by 1980, cable guides were pretty common. But I don't know for sure when cable guide braze ons became standard on Paramounts.

Second, the seller claims a weight of 25-26 lbs. If the seller is right, that weight is wrong for a 531 bike with high end gear and this is a small bike.