Coins that you've never had in Mint State or Proof condition!

What are the most common U.S. coins or coin types that you've never owned in Mint State or Proof condition? And I would appreciate it if you would tell me why you have never acquired those particular coins in MS or Proof.

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Jeremy
For some life lasts a short while, but the memories it holds last forever.
-Laura Swenson
In memory of BL, SM, and KG. 16 and forever young, rest in peace.
I have never owned a Franklin Half dollar in Mintstate, (in my personal key-date collection) that is. (Yes Lucybob, its true)
jim
Indian cent
Buffalo nickel
Barber dime and quarter
Peace dollar
I probably have an Unc. wheat cent and I might have an Unc. Frankie,
but I haven't checked those coins with a magnifying glass yet.
Indian Head Cents
Liberty Nickels
Standing Liberty Quarters
Barber Halves
Gold $2.5-$10
Liberty Gold $20
For the 19th century, the only type I do have in MS are Morgan Dollars.