Piatnik-Ritter No.240 playing cards, pre-1946, when Ritter were Nationalised and became a part of OTK (along with the other printing industries in Czechoslovakia). The ace of spades states: “Made in Czechoslovakia”. The logo on the ace of hearts states: “Ferd Piatnik & Sons Ritter & Comp Praha”. see https://www.wopc.co.uk/czech/casino-240