I have a 53 cm Columbus SL frame that weighs 4 pounds and a Chromor 53 cm that weighs in at 4.5 pounds, both are late 80s. I would guess your frame may be Aelle. As to value, there is a guy up in Tacoma, WA that has been selling NOS, early 70s vintage, Garlatti bikes for $300 each on craigs list. They appear to have a Campy Gran Sport group with steel cranksets that are the old pinned style. Last ad I saw he only had a few left. REcently, on e-Bay, a NOS Legnano with a Campy 980 group sold for a bit over $300 & a NOS Benotto with Campy NR had a bid in the high $300s but didn't make reserve. Don edit: Here is the link to Craigs list go to
http://seattle.craigslist.org/sno/bik/255617680.html