Jetons: Their Use and History (1986)

Kind of looks like a big coin: https://www.google.com/search?q=jeton&client=safari&hl=en-us...

I don't know if it's related but "jeton" is the Turkish word for those coins you use to board the ferry or pay the toll for anything. I think it's originally French.

It is indeed a French word

Reminded me of the Chicago Transit Authority (CTA) tokens [1].

Used to be the way to pay fare on trains. Nicely designed, though too easy to confuse for a dime (10cents) in a pile of coins.

[1]: https://www.wbez.org/stories/what-the-l-happened-to-cta-toke...

I was disappointed that Mardi Gras Doubloons only date back to 1960 and don't link all the way back to these: https://en.wikipedia.org/wiki/Mardi_Gras_Doubloons

Sadly, kept reading as "Jetsons". I suspect this mis-read is correlated with age of the reader. On the positive side, learned something new about something old from parent.