Well let me start out by saying that I am not a professional appraiser, simply a collector and fellow Stallion owner. With that said, I have done quite a bit of research and I am happy to give you my opinion that $600 would be pretty high. Your bike looks like a fairly nice bike, even better shape than mine. The missing fender would bring the value down a bit, though.
I have seen very nice Stallions priced at $500 (not sure if they sold or not) and I have seen rougher ones as low as $100. I think yours would probably fall somewhere in between that range. However, the saying goes, it's only worth what someone is willing to pay for it. If you can find someone that wants one really bad, maybe someone that had one as a kid and wants to relive their childhood, they may be willing to pay $300 or so for it. E-bay is probably your best bet for a sale.
However, remember, we're in a down market for collectibles right now and there are great deals to be had because with the economy, it's a buyers market at the moment. Mattel bikes do not have near the following of the Schwinn Stingrays and Krates which can bring big bucks. The Stallion is kind of a rare bike but it's also the lower end of the Mattel line. The model that I believe is more sought after is the Bronco or V-RROOM! bikes with the fuel tanks and V-rroom! engines.
Good luck with your bike. Please follow up with us if you sell it and let us know how it went so we can be better informed and share your story with others. Also, please be sure to tell the new owner about us. Take care!
hello. i have a mid sixties bronco without the vroom engine. bike was my mothers and she sold it as a teenager. i ran across the bike in 1989 when i was cropping tobacco for the people she sold it to. i have been thinking about selling it but i don't know what its worth any help would be great. i also have an have a lot of columbia tandem bike parts. everything but the wheels seats and chains. i would be willing to sell these bikes if the price is right.
Personally, I think you should keep it and restore it. IT WAS YOUR MOM'S BIKE!! How many people can say they have their mom's bike? Totally cool. However, if you want to sell it, E-Bay is probably your best bet. I have seen them go for several hundred on Ebay when they are complete and original. Looks like it's a great little bike except for the repaint and the incorrect wheels. You should try to find the original wheels if you can. If you decide to sell, you may post an ad for FREE in our classifieds. Good luck with it.