Pennies are the cheapest " coin " in the U . S ., 1 / 100 of a dollar, 1 / 5 of a nickel, though as zinc is not what I would call a coinage metal, I think one could fairly dispute whether pennies are coins at all.
22.
Historically, a great quantity of coinage metals ( including alloys ) and other materials ( e . g . porcelain ) have been used to produce coins for circulation, collection, and metal investment : bullion coins often serve as more convenient stores of assured metal quantity and purity than other bullion.
