New Norton Singles had oil pumps

Most Norton Singles had oil pumps made from corrosion-prone material that now, after decades, slowly change into dust.

Having started on a Norton Single and ridden one for many years Andover Norton's director Joe Seifert was keen to get these pumps into production.

You can now get the cobwebs off your ES2, Model19, Model18, Big4 or 16H throw out the dusty remains of the original pump, put ours in and get back on the road!

http://www.nortonmotors.de/ANIL/News.htm

I'd comment that all early dommies had those zinc oil pump bodies too.
Mirror images of the single cylinders ones, so not interchangeable.
Once had one split about in half......

From this thread title, thought there were going to be new single cylinder Nortons !?