Ok, last year I posted on this sled I found and purchased on an online auction. I was moving it from one shed to another and (my son had robbed some suspension stuff off from it so the two rear bolts were out) the suspension extended down, low and behold I see it says "Proto" on the underside tunnel. Like I said last year there is no serial# , no marks on tunnel at all ,and the tunnel decal is "GT" bronze laid over a "1982" red and black tunnel decal. Interesting , lets hear some feed back. Joel