by Shufton » Oct 6th, '08, 06:15
Even in the states, these coins are old enough so that most folks have not seen them before. I don't think familiarity with a particular coin matters. Spectators know what a coin is. As long as everything is carefully shown and explained, all is well.
Silver dollars are nice for a few reasons. They look nice, and since they are large, they show very well. The pure silver makes them ring like a bell when you flip them. If you get old worn ones, you can do routines that require "soft" coins.
Other coins can work just as well!