Nice find for free! I would question the $1500 estimate given the repaint. These models typically had full chrome forks and some on the rear, either on the chain stays/ drop out and maybe the seat stay. Often the chrome was painted over.

Looks like you have clinchers. The oil clips on the hubs look foreign to me, not Campagnolo. The stem is a 1A model.

this is my 1983 Superissimo. The date comes from the RD which I 90% sure is original. note the difference in the fork crown. Superissimo model had chrome on the head tube but is nearly identical to the Super. In some cases Super did not have a chain stay bridge IIRC. If you go to my flickr account. You will find hundreds of pics of this bike including the details of the Super Record head set. You can tell the difference by the fact that the SR HS has aluminum race on the bottom. Record had steel and is has "thicker" crown race.

the bike pictures has been brought back to era correct parts with exception of the chain and freewheel. Well some would argue that the stem and HB should be 3ttt to be accurate to a factory build.

1983 Colnago Superissimo by Patrick Boulden, on Flickr