As far as U.S., I'm a type collector-
Half Cent through dollar. For
Half Cent and cent, I start at Coronet type, but fir all else, I start at Seated Liberty. Can't go back to Capped Bust just yet. Do have multiple Barbers, Walking Liberty, Mercury etc. Still lacking a
Twenty Cent Piece: I'm gonna need to conjure up about two bills for one of those.
For World, I like Commonwealth, South America, Germany, France etc.