[silver, cupro-nickel]		[clay bricks, cobblestone]

Since the weight and size are finely balanced, the Peace Dollar — predecessor to the Eisenhower variety — should fare well on a roll at a rather bumpy flooring such as the Vatican´s outside piazza. This would be an interesting matchup. The coin should be able to handle its own for a considerable amount of time before the flooring takes hold of the momentum.