I'm helping My son Erich look at some primary sources for the WWII war time coinage, inparticular the Nickel, Cent, and Canadian Nickel. We came upon one article in the NYT talking about a proposal to make 12.5 cent coins but the min actually preferred a 1/2 cent piece of plastic. The reason for the 1/2 denomination was to deal with sales taxes. Obviously that proposal didn't become law, it'll be interesting to find out why not.