and here it is! The Yonezawa Moon Rocket XM 12 from 1956! The body looks the same as Cap Scarlet's rebel jet below to me. So which came first - TV21 #242 or this Japanese tinplate toy? BTW the top box is a repro from those ace box-makers at ToyTent. Bottom pic from OzziesRobots.
PS. The tinplate rocket came first - dated 1956. TV21 #242 from 1969.