Casino history is easier to see in the objects than in the legends. This...

https://wiki-mixer.win/index.php/Roulette_Pockets_and_Numbers:_How_the_Wheel_Makes_Outcomes_Visible

Casino history is easier to see in the objects than in the legends. This article follows the marks left by cards, roulette wheels, and slot reels, including the difference between single-zero and double-zero wheels