Assistance with Buffalo Nickel series

On the population report I noticed they have listings for S and D (for the San Fran and Denver mint), but I also see a "C"?
Is this C supposed to be Philadelphia? Or what's the deal with that?
Is this C supposed to be Philadelphia? Or what's the deal with that?
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BST transactions: dbldie55, jayPem, 78saen, UltraHighRelief, nibanny, liefgold, FallGuy, lkeigwin, mbogoman, Sandman70gt, keets, joeykoins, ianrussell (@GC), EagleEye, ThePennyLady, GRANDAM, Ilikecolor, Gluggo, okiedude, Voyageur, LJenkins11, fastfreddie, ms70, pursuitofliberty, ZoidMeister,Coin Finder, GotTheBug, edwardjulio, Coinnmore, Nickpatton, Namvet69,...
1913 5C Type 1 MS
1913-D 5C Type 1 MS
1913-S 5C Type 1 MS
BST transactions: dbldie55, jayPem, 78saen, UltraHighRelief, nibanny, liefgold, FallGuy, lkeigwin, mbogoman, Sandman70gt, keets, joeykoins, ianrussell (@GC), EagleEye, ThePennyLady, GRANDAM, Ilikecolor, Gluggo, okiedude, Voyageur, LJenkins11, fastfreddie, ms70, pursuitofliberty, ZoidMeister,Coin Finder, GotTheBug, edwardjulio, Coinnmore, Nickpatton, Namvet69,...
The only "C's" that I saw were for Cents as in "5C", such as...
1913 5C Type 1 MS
1913-D 5C Type 1 MS
1913-S 5C Type 1 MS
Ditto....5c = five cents.