Ping!
In 1984 I dated a woman who was stationed in Korea. The Korean 100 won coin (value about 11 cents) was the exact size and shape of an American quarter. We had a ball with the vending machines at the hotel in Honolulu.
More recently, when the Euro was launched (after all that ''extensive research in order to make the Eurocurrency the ultimate in currencies", Wim Duisenberg, 1995), these geniuses discovered that, lo and behold, the 2-Euro coin (=USD 2.34 at the time) was the exact size of the Thai 10-baht piece (=USD 0.26), and within 2/100ths of a gram of its weight. Talk about an arbitrage! Friend of mine in Thailand made about USD 8,000 before they pulled the plug on the game.
So, did the dingalings in Wonderland change the currency? Don't be silly -- they coerced the changing of every coin-vending machine and change machine on the Continent, at a cost of some E 2 billion.
The Peso used to work as quarters in the toll booths in Illinois. Ended up being cheaper than the US money. :-)
Shame on you. ;-)