PCGS SP Grade

I know this has been discussed before, but I'm still not sure I fully understand the PCGS SP grade. Is it a different definition for classics than it is for moderns? For moderns, does it just mean non-standard finish/strike (i.e. SMS coins, Satin Finish, Enhanced Uncirculated finish, etc.)? It seems that many of these modern coins that are given an SP grade are struck on specially prepared blanks, and struck multiple times. Those should be considered proofs, right?
Anyway, I'd appreciate any clarification you guys might offer. Thanks!
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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Also, some of the Satin Finish coins are given MS grades while others are given SP grades.
US and British coin collector, and creator of The Ultimate Chuck E. Cheese's and Showbiz Pizza Place Token & Ticket Guide
Specimen
Seems like it's used as a catch-all for not intended for circulation coins that would not be considered proofs.
Collector, occasional seller
Maybe it's the inconsistency that confuses me.
US and British coin collector, and creator of The Ultimate Chuck E. Cheese's and Showbiz Pizza Place Token & Ticket Guide
in past years they were calling ms what they would call sp now. so older labels would be showing ms and newer labels sp. in fact coins once receiving ms might now receive sp given the change in recognition.
I have recently seen on ebay a 2020 palladium in a ms holder. perhaps this is one of their errors.
look to the pop reports/price guide for any coins in question to see what the current designation for an issue might be as you can see what is listed there. or ask here.
Here is a Great Britain PCGS Specimen coin that appears as almost a matte proof (1920 SP61 Halfcrown - Unique according to ESC/Bull):
Well, just Love coins, period.
Ask Brett