Not many of these around anymore, so before selling, thought I'd see if anyone had a ballpark figure.
'85 Mongoose full chrome MTB. Triple butted cromoly. Bullmoose bars. Huret RD, Shimano Tourney GS crank. Pitting on the BB shell due to design with cable guides on top leading to water pooling.
Similar to this one though the parts mix is different: http://mombat.org/MOMBAT/Bikes/1985_Mongoose.html