Cant tell you anything about it but their is a norton 16 h in cheffins sale at the end of the month at sutton near ely cambridge google cheffins and look at their website its the vintage machinery sale
I can't seem to find it Stephen, I've looked through the auction items but can't see a 16H, can you put a link to it please.
Its in classic car weekly in cheffins ad 1940 norton 16 h i dont think there catalogue is on the net yet but its the sutton sale sat 27th april. ring them 01223213777