Franklin Delano Roosevelt died in office in 1945, but Roosevelt dimes began in 1946. Carr's fantasy piece is dated 1945 and, like all Moonlight Mint fantasies, was overstruck on genuine coins, Roosevelt dimes in this case.
248 of this coin design were struck before the dies were destroyed. As is typical with these, a few were struck over other coins - in this case, three on US Mint copper-nickel clad dime blanks. Daniel keeps those. It will be interesting when these fantasy-fantasies do finally come on the market.
Note: All my coins are in a safe deposit box. I keep nothing in my home.
Contests and giveaways: http://coins.aplawrence.com/2014/05/contests-and-giveaways.html