Redline doesn't make mags. That looks like a Skyway Tuff II (or a close copy). That also doesn't look like a 1980 MXII Redline (although that is an MXII style front badge sticker). It looks like a Redline 500a from about 1985 or so. I'd say the black Tuff (if it is indeed an actual Skyway tuff), if it's relatively true and the coaster guts aren't blown out is worth maybe $25 to the right person (or $0 to most of the people on here). Try Ebay. The Redline, in that condition, is worth maybe $50 tops. That Magna isn't worth squat, except maybe a toss into a dumpster.