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You are right, it could be a Major investment! Initially, these figures were considered a “poor man’s Action Man” when Mattel launched them in the late 1960s to reflect an interest in the space race. General interest waned within five years but they stood the test of time as far as collectors were concerned. As well as Major Matt there was Sgt Storm, Doug Davis, Geoff Long and Callisto the alien. Yours could be worth between £400 and £600 if the creases on the cardboard back are not too severe. Mint examples are extremely rare.