And, how much is each worth? Been wondering this awhile now.
They are specially made for the Assassins. They are a reference to the coins you use to pay Charon for passage to the underworld in Roman Mythology.
I saw something when the movie came out saying that if they are solid gold they would be worth 4000-5000 each depending on the exact size.
ETA:
Here you go
https://en.wikipedia.org/wiki/Charon's_obol
Awesome answer…thanks for that.