John, in Florida. Collect WWI commemorative medals--not awards and ribbons (especially Jutland/Skagerrak), many
US coins by mintage (< 1 million), and US paper money, especially $5.
For WWI commemorative medals, I have several references and can help attribute German and British; sorry, very little info on Austrian, Turk, or Russian medals.
Currently doing research on Jutland/Skagerrak from both Britain and Germany (and the lone French one).
Also doing research on 1963 $5 USN notes.
Hope is to publish both research sometime next year.
John