Hi everyone. I was just over at the Great Collections web site looking at Barber dimes. Saw this one, and am wondering what the "RPD" designation means?? I am just starting out w/ building my Barber coin collection (starting w/ dimes), and would like to learn all I can. Thanks. Here's the link http://www.greatcollections.com/Coin/213222/1908-D-Barber-Dime-RPD-FS-307-PCGS-G-04