The Peill and Putzler mark is nothing like this Christine - it's a P and it's mirror image, sharing the same "stem". It's normally on the body of the piece, near the base. However, the effects seen in the shleiergraphit can vary considerably.
Jury's out as far as I'm concerned on this piece - this does look like an "official" acid etched mark, though.
Was it not Marinot who "invented" shleiergraphit, well before Horst Tusselman designed for P&P using this technique. Other makers may well have used it.