After a search on the Internet, I have found that it is indeed a Bosch product, but made in France in about 1921. They were fitted to many four cylinder vehicles of the period, such as Amilcar, Bugatti, Citroen, Peugeot, Salmson, etc.. If you know anyone who could use it please let me know. It sparks well, but feels a bit rough to turn over so will probably need a rebuild, or at least a good stiff looking-at. I’m looking for £200, or would gladly exchange for vintage three-speeder Scott parts.