10/7/2014 8:46 PM
Edited Date/Time: 10/7/2014 8:48 PM
According to the brake bridge info on the Vintage Mongoose website your frame is not a Supergoose then. That being the case, I would guess that yours is a Motomag. The Motomag had what is referred to as a tri-moly frame. This means that the frame's front triangle tubing is chromoly while the rear triangle tubing is mild steel. This will most likely decrease the value but it's still a vintage frame and it will be worth something to a collector. As I said before, ask the guys over at BMX Museum and check out ebay to see what Motomags are currently going for. I hope this helps. Good luck and let us know what you find out.