If you're asking what WAS it I dunno. I'm not crazy about the 'inpaint' (I think it runs contrary to the purpose of parallel fourths). I can't tell from this picture, but this guy has done to this guitar (IIRC) a split nut - the guitar is tuned EADGCF, except that there's a 1 fret reduction (or extension depending on how you view it) between the top two strings and the bottom four, to give open B,E options but maintain the parallel fourths tuning.
But the jack is kinda cool.