The Cat mini bikes had lots of different models. I say if you already HAVE 3 or 4 and WANT to collect them then collect the bitches. Some of them ARE pretty valuable. A Slingshot chopper or Muskin or something brings a decent price. They are mediocre ones. Not super rare or super desired BUT they are nice little bikes, 40 years old, and a name brand American company. Some of them had a little chrome penut tank with a Cat sticker on it with a black panther and the bigger spoked wheels and I say if you want one of each, if you ended up with one each of every Cat they ever made and nice ones, you'd be talking thousands of dollars. $200 - $800 each ads up pretty damn fast when theres 35 different models. Yeah Cats are cool.. collect the hell out of them.. OH... and yeah there is the frames like yours, some had suspension front and springy seat, some were none, some were disk brakes, some were scrub..... Then there is the HPE Muskin type frame that has the tilty motor and jackshaft and big wheels.... And Cool Ass little chrome tank...