1978 Topps BLANK-BACK PROOF #473 Bill Buckner (Cubs)

1952 is often thought of as Topps 1st baseball card set, but it was not.
Topps issued several smaller baseball card sets prior to their huge 1952 set.
Topps buzz word was "BIGGER is BETTER" for their 1952 Topps set which Topps described as: "GIANT IN BOTH SIZE and NUMBER of CARDS" (407).

Key card in the 1952 Topps set is #311 MICKEY MANTLE. Often called Mickey Mantle's Rookie card - BUT IT IS NOT. That honor goes to his 1951 Bowman.
1952 Topps "High Numbers" (#311-#407), are very, very scarce with an interesting story:
This HUGE set was released in series weeks apart. By the last (6th) series, baseball season was over and football starting. Candy shops had plenty of baseball cards from earlier series so most cancelled their orders for the last series creating the scarcity.

Adding interest is how Topps disposed of the now un-needed cards including THOUSANDS of 1952 Topps MICKEY MANTLE's. They dumped them into the Atlantic Ocean like most of New York's trash in those days.

1968 was an awesome year for Topps test & oddball issues with Game cards, Player Posters, 3-D cards, Plaks, Discs, Punchouts and these "Baseball Action Stickers" also called "Action All-Stars Stickers".

"Baseball Action Stickers" were STAR-PACKED 3-panel sticker strips, some with facsimile autographs. There were (16) different strips in the set but only 12 are totally different. #13 thru #16 re-used panels from #1 thru #12.

Strips were perforated, folded at joints and put in packs. Boxes had 12 packs (10 cents each) with 1 sticker per pack. Sets could be made back then for $1.60. Today, the Mantle panel goes for around $2,000.

Collectors often collect just individual panels as complete strips are so scarce, fragile & EXPENSIVE. Single panels themselves are quite scarce - in 20+ years PSA has graded just over 200 TOTAL compared to over 1,000 1952 Mantles !!!

PROOF sheet below is missing the facsimile autographs.