ok - not sure of it's retro status but i have a 91 mongoose iboc pro for sale - all original spec except that it has ritchy megabyte 2 tyres 1991, onza alloy bar ends also 91.
Rest of the spec is standard:
20" Frame in Red - Full Cro-Mo
Full Shimano Deore DX Groupset
Araya CV7 32 spoke wheels
Ritchey Megabite tyres
Tioga T-Bone Stem
Onza alloy bar ends
It's been mine since new - even have the handbook.
Its in great condition, frame has a few scratches - no dents. Not sure of its worth - not a lot I doubt - make an offer:
if you're not interested but know its value - let me know so i can flea bay it - ta.