Which series are the hardest to find?

Putting aside coins pre-Seated period and the dollar denominations which are all obviously extremely rare to find, how would you rank the coins in order of hardest to easiest to find?
The Contestants:
Seated Half
Seated Quarter
Seated Dime
Seated Half Dime
Barber half
Barber quarter
Barber dime
Walking lib half
Franklin half
Standing Lib quarter
Washington quarter
Merc dime
Roosie dime
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Comments
Would it not depend on what mint they were minted? I would think some mints would be much tougher due to lower mintages. Just a guess I would imagine lower denominations lay around much more than say half dollars.
Or maybe you just mean in general.
Franklin half is tougher than any of those halves, other than Seated.
Barber quarter is the toughest Barber coin.
Seated dime is more common than Seated half dime and all other Seated denominations.
Great list! I'd say rarity climbs with age and denomination.
The older quarters seems to be the most elusive to me in finding, right place right time, fwiw
For me, Franklin, Barber, and Seated halves and Seated quarters all represent empty blanks on my finds list.
Aq it’s funny, I found both a barber half and a seated quarter, but I’ve never found a Washington quarter.
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But have you found a Frankie?? At this point, I feel like I’ll find half a dozen barber halves before I find one Frankie.
Nope. They hardly circulated I would guess
Latin American Collection