PO-0.5 and still recognizable?

Which coin could have the most amount of wear and still be identifiable by date and mintmark (if applicable)? Let's assume the coin has "normal" wear patterns for that series.
US and British coin collector, and creator of The Ultimate Chuck E. Cheese's and Showbiz Pizza Place Token & Ticket Guide
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Comments
Chain cent (though you couldn't distinguish the AMERI and AMERICA varieties, probably)
1796 quarter
1859 IHC
==Looking for pre WW2 Commems in PCGS Rattler holders, 1851-O Three Cent Silvers in all grades
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<< <i>some coins / types do not need a date to be recognizable >>
True, but I wanted to know which coin could have the most amount of wear and a person could still identify the date.
US and British coin collector, and creator of The Ultimate Chuck E. Cheese's and Showbiz Pizza Place Token & Ticket Guide
<< <i>My guess is one of the larger Seated denominations. Relatively speaking, the rims were thick and bold, the date numerals were large, and dates were positioned somewhat away from the rim and close to the base of a bold Liberty design element -- all characteristics that would protect at least parts of the date for a long time as the coin wore down. >>
Maybe something like an 1847 dime?
Wow!
1793 Chain POO1:
1797 1c POO1:
1884 5c POO1:
1837 No Stars 10c POO1:
1964 50c POO1:
1921 Hi Relief $1 POO1:
1908 $2.50 POO1:
If I had it my way, stupidity would be painful!