The Coins

[DeafGrimm]

According to the tattoo on this guy, it appears the entire set of the coins used to be a set of 10, but only 3 were known to exist.

Anyone know of the lore/story about these coins? What happened to the other 7 coins? What were they used for originally?

This is from Season 2 Episode 1.

[DeafGrimm]

Also, it was never explained who gave Kimura that sandwich which was poisoned and killed him. Renard? The killer's face was never shown.