I like how the English does portraits of their monarchs. Especially Queen Victoria and Elizabeth II. (Of course that would not work here) Multiple portraits as they age. I also like the idea of having our founding fathers on coins. To a much lesser extent - I like the presidential dollar series as it is a good teaching tool for kids. I do not like the garbage (most) that the mint is producing these days. I do like the classic designs from the past.
Privy marks are fine when they represent something special (significant) - not national doughnut day or the like.
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One of my favorite designs is the flying eagle cent. I also like the Mercury dime, Buffalo nickel, all of the Indian head designs, and the capped bust coins to name a few.
what will the mint produce next??? Scary!