67 dart survivor found

67 dart gt 273 commando..150 thousand miles 99 percent original..no rust that i could see.273 auto runs very good...origanal rallys,,black bench seat ..interior great shape..rebuilt auto trans..was yellow now gold...supposedly sat in a garage for 15 years...missing fr window trim...dash nice..pwr/str...id like to make him an offer,but hes got gold bricks dancing in his eyes...but he is realistic...anything sells for what one can get for it,or for what one well pay....but how much should this sell for...he thinks about 18 thou but i dont think so...what does everyone or anyone on this site think...all comments appreciated...tx...j