Casino history lives in worn cards, roulette wheels marked single-zero or...

https://varimail.com/articles/why-reels-became-the-default-way-to-show-slot-outcomes/

Casino history lives in worn cards, roulette wheels marked single-zero or double-zero, and slot reels built for play. In 1895, a San Francisco workshop shows how small objects hold the marks of changing games and public life.