So at Vancoufur 2016 there was a neat idea, a sort of "con currency" Anyone could help out con staff and in return get a "Helper Buck". Then at closing ceremonies there were items that could be bid on with these "Helper Bucks". I like the concept, it encourages people to contribute, offers a tangible way to give back to people that help out and are another neat collectible from the convention. Total credit goes to whoever thought up the idea.

Top is the original coin from Vancoufur 2016
Middle is so milled plastic coins (5 Blue Bucks)
Bottom are a couple milled brass coins (10 Brass Bucks)

I'm just playing around a bit, seeing what would look better for an engraved coin. The relief engraved coins are closer to what actual coins would look like but I prefer the look of the non-relief engrave. I tried a couple using clear polycarbonate but found that being able to see both sides of the coin at the same time distracting and harder to read.

I changed the deer from the original coin to a 6 point buck, cause that's what my fursuit is ;p

The deer rear one was just being silly, from the term "heads or tails" this one has a deer head and the tail :3

I made these just for fun, kind of a physical concept sketch, brass would not be a great choice of materials (although it does make a satisfying coin-ringing sound when flipped) and engraving them like this takes too long to make very many and they would tarnish quickly. A laser cut acrylic would probably work best (despite the cedar wood of the original smelled really nice!) plus then different denominations can be different colors.

Technically these should be called tokens and not coins, these aren't government issued ;)