was that the orange 91 Air Master... they are pretty desirable bikes
I've got a 91 minty Sport so I'm hoping that will fetch a decent price.
Depending on the resto job you can do... i.e. get it looking minty fresh again, you could get £200/£300 on ebay... maybe.
Negative factors are that its an awful colour and there was a load of cheap Haro frame that came after that look very similar... Zippo, Revo etc.
...that said I sold a pair of the forks like on yours with screw in pegs for £100!