Just got hold of some US penny and dimes and thought they are tiny (and very thin - this can't be seen in the photo) in comparison to the other coins I have. The following is a row of coins of similar fiat value. Left to right: US dime ($0.10), Singapore 20 cents ($0.15), Malaysian 50 sen ($0.12), 1 Chinese Yuan ($0.14), 1 HK dollar ($0.13), 1 Macau Pataca ($0.12) As you can see, the HK dollar coin is huge considering the purchasing power it has. HK has huge coins and notes. The Malaysian 50 sen is value for money for it's copper bulk. Most other coins are made of steel, essentially worthless.
