So one thing I've noticed is that a good amount of collectors seem to enjoy Spanish currency; especially those who predominantly collect US coins. Ever since I began collecting I had some fascination with the old Spanish reales of the 17th and 18th centuries. Eventually I learned about the different denominations; 1/2 reale, reale, 2R, 4R, 8R, escudo and so on. I find it very intriguing how Spanish coins are something of a record of how our coin-minting technology grew over time.