Reply #32: I think half-dollars are the largest diameter of the coinage.

[kentauros]

Still, they don't show up in circulation much, so I can see how people would mistake them at first glance.

It's interesting how in this country we make the coinage different sizes, thicknesses and knurled or flat edges, yet the paper money is all the same size for all denominations. Do blind people only use coins for cash? ;)