c. 1950s. First is lot of seventeen 2.75x4.5" magic pictures, each showing various characters from show in negative bw print. Point of card was to stare at center for 30 seconds then look at another section to see reverse optical image. 24 cards made up the series. Included here are #4 Tonga, #5 Atmosphere Helmet, #6 Tonga in Space Helmet, #7 Robot Man, #9 Cosmic Ray Gun (cut off-center), #13 Flying Saucer, #14 Speeding Jet Car, #15 Deadly Iron Fist, #16 Trooper in Combat Helmet, #17 Special Agent Jack Narz, #18 Buzz in Space Patrol Cap, #19 Happy in Space Helmet, #20 Planetoid Prospector, #21 Space Pirate Captain, #22 Veteran Spaceliner Pilot, #23 Buzz Corry's Special Insignia, #24 Carol. Back of each card has additional text pertaining to the front. Cards Exc. Back bottom shows images of Rice Chex, Wheat Chex and explains the availability of the cards in every package. Lot also includes 3.25x5.5" typed postcard dated 1952 explaining "We are temporarily out of stock on the Space Patrol Membership Kit which you requested. Please be patient. Ralston Purina Company." Exc. Also included is 8.5x11" folded as issued letter on Ralston Purina Co. stationery welcoming members w/"Dear Cadet: Thank you for being so patient with the delivery of your Space Patrol Membership Kit. There were many more problems involved with the manufacturing than we anticipated at the time we wrote you...Ralston Purina Company." Letter is folded as issued. Exc. A nice group.