I have seen Seated coins and some gold coins usually Liberty double eagles with the PL designation. I wonder if any other coins other than Morgans that have gotten the DMPL designation. I can't recall ever seeing one.
The relative commonality of PL/DMPL Morgans is due to their huge mintages and lack of thorough circulation. Lots of dies were used, and most were repolished during their lifetimes, multiplying the chances for PL/DMPL examples from fresh-surfaced dies. Other Classic coinage had much lower mintages - fewer dies - and circulated heavily.
But they're there, and when you see one, it stops you in your tracks.
Here's a PL graded Mercury Dime. It shows a lot of die polishing lines. I have an NGC MS66FB* 1944-D with a super-hammered strike from a polished die that I would describe as proof-like. It's defied my efforts so far to get a good picture.
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