First of its type that I've seen, myself. I get all kinds of the smaller Jamacian coin steel crap off the magnet, but this is a nice bimetallic coin like a toonie. Decently made, cu-ni center with brass ring. I was then struck by the change in value, and I had to plot it over time. Hard to believe that in the 70s the Jamaican dollar actually exchanged at more than the USD.
So I had to plot it. This isn't true hyperinflation in the 1923 Weimar Germany sense, but it's debasement as a rate that isn't practically any better than hyperinflation. Apparently in Jamaica you'd best not plan to keep any assets stored in Jamaican dollars!
Today, a Jamaican dollar is worth less than a cent. This $20 piece is now worth 19 cents US (and that's 19 cents of a debased USD to boot).
Think it can't happen here? It already is - it's in slow motion now, but the steam will be picking up. Get ready...