I recently submitted a similar query on an unidentifiable mintmark on a Morgan dollar and got the same answer. It is what it is.
I AM GOING TO AGREE IT'S ERROR MISPRINT HAVE EXACTLY SAME MARK JUST FOUND ON MINE. SO CAN'T BE ANYTHING ELSE. THEY LOOK LIKE TWINS. SO CAN'T BE P AND SMASHING OR I WOULD NOT I MEAN SAME MINT MARK TO THE T IT'S SAME AS HIS.