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It was probably for reasons having to do with the cellulose acetate warping if the cards are stored on their edge or something similar.
I'll take a shot in the dark and say that Bakelite was used from 1935 to 1950ish, similar plastic cases in the same shape until about 1965, the simpler black plastic flat cases until about 1980 and the slip cases until 2004. There's a three or four digit code on all their Aces of Spades.The second was in 2011, when it was learned that two players bribed USPC print shop employees to include a subtle mark on the cards to differentiate low cards (values 2 through 7, with the spades being more prominent) from the rest.The markings were discovered during a round being played on the "mothership" table - the center table with all the bright lights used for final rounds and such.Here's the thing: every deck of Kem branded cards made from 1935 until 2004 when they got absorbed by USPCC has the same Ace of Spades.It looks like this one:(See Picture #1)Notice the date of the copyright - 1935. Check the replacement card put in every Kem deck made from 1947 to 1970 or later:(See Picture #2)Sure enough - every single deck or pair at least has a card with COPYRIGHT 1947 along the bottom edge of the card. You see an awful lot of claims that the case is Bakelite. Again, there are visual cues: (See Picture #3)The spread out K E M wide spaced letters IS indeed Bakelite! Hard to say - in general they made a lot of them, not always, but most of the time.