Rob, there can't be many around. Most in the UK would have been changed for Lead-Acid during the war. Belgium and France are the most likely place to find one. A request on Facebook, with it's translate facility might be a good idea.

For info, this is what a December 1936 example looks like.

Rik

Like Ni-Fe batteries themselfs, I am convinced somewhere in the French or Belgian countryside there are some hidden examples of both in a forgotten corner of a shed/barn of an owner who does not know what to do with it or even knowing to have it/them.

Cheers,

Rob

email (option): wd16h@telfort.nl