I realize this is probably too late, but it does sound like a 1987, in which case it should be Shimano 105 equipped , Tange #1 tubeset and had an original price of $530. They do seem to sell for slightly higher prices than other 105 bicycles, probably because of the #1 tubing and Dave Scott name. It could be a fair price depending the bicycle's condition and the local market. Sorry I didn't get to this earlier, but I can't stay camped on the site all day.