In the end I found a the correct Rearstand for my Norton 16H. There was a wrong one mounted somehoh on the bike. See pictures. Does any one know where this stand fits too?
Some rear stands were held in place buy a stud instead of a return spring. Vincents, Model 2 AJS V twin etc. The pictured one looks too heavy duty to be a front stand.
Doesn't look like a front stand, too wide at the back. My bet would be that its homemade as rear stands were quite hard to find at one time, before the Indians started making them.