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Free Spirit was a name that Sears assigned to many of their bikes - some were good, some were terrible. Yours is not a vintage mountain bike, or a Sears. You may do better to check with bikeforums or mtbr.
I think its a cool bike, even if its not name brand. Didn't Manitou experiment with a similar form of rear suspension?
The swing arm and shocks appear to be alloy castings. The brakes make me think it is early 1990s.