I've never seen a factory 915 pinion stamped / marked like this and take it this is an aftermarket set. Or was it supplied by Porsche? The "N" number is indeed the pinion depth correction in hundredths of a millimeter. So, absent information to the contrary, I would take this marking to specify 0.01 mm correction to be added to the measured value. But I would ask Hoer the question.
I know Hoer makes r&p sets for 356 series cars, was not aware they have/had anything for 901 and 915 transmissions.
