This is a bit of a dark horse as far as I am concerned. A set of eight Thunderbirds' picture postcards manufactured by C.G. Williams Ltd. Apart from the ad displayed below, I have no information about them so I don't know if there's more to this set. As far as I can determine, the first six cards in the set are equivalent to the character title cards used in the Thunderbirds opening sequence minus the lettering. The other two I assume to be publicity stills AP Films issued at the time.