Weird degenerating coin

[james croft]

I'm with Mike on that theory as well.

 

[ScubaJorgen]

I'm probably way wrong here, but- these look a lot like the wrappers of chocolate coins- some of them are usually based on a similar type of coin. Just a thought!

Crossed my mind that these may be some monopoly coins or wrappers. Pretty sure they are not:
- The material is copper, not aluminium
- They look very realistic
- Posts in this thread show good explanation on the phenomenon