From:Rohan e-mail:nobolts3atyahoo.com
Subject:RE: magneto Date:Sat Aug 30 22:20:11 2014
Response to:5324
The American Bosch AT4 is listed as standard ignition on e.g. Case farm tractors, circa 1923.
Plus on other tractors stationary engines etc.
A closer view of the patent numbers may narrow it down.

American Bosch manufactured a large range, in huge numbers, so most models are not exactly scarce. Farmers being farmers fitted them to anything that needed a magneto...
Hopethishelps.

Which direction does it spin ?