sounds like the seller was having a lortab moment when he said 16.8 lb. Man, with lortab my bikes don't weigh anything at all...
This is kind of a funny bike - clearly a nice frame and fork, and yeah, the early stuff was HG, but the handlebars are a lot older than the rest of the bike...the seatpost is newer, and campy...that isn't a cassette, it is a regina america freewheel (good stuff, but I think it is newer than the bike too...
I'm guessing that this is a frankenbike that the guy had high expectations for and, well, it didn't work out that he could drop his buddies on their Cielos...
$600's too much unless you just have to have that particular bike.