This advert in the March 1970 issue of Games & Toys magazine introduced the three toys not mentioned on any of the later Pippin-produced Spacex blister cards: LEM Apollo, Photonic Space Station and the Soyuz pair.
The claim of 37 items in the range is a mystery: with the three new toys announced in this advert, there were only 36 toys in the total range. So it's not at all clear what the 37th "item" could refer to. The Spacex Commander badge perhaps?
The advertising mentioned here can be seen in the Consumer Advertising section of this site.