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Yes, these are so rare, I never saw one before until I found that Photo.Nürnberger wrote: Hello Danny,
thats an absolutly outstanding accessory, made by Schoenner.
I add a catalogue pic. There is also a second version known with clockwork drive.
Hummm I can read 19 mm on my answer Danny ...nuvolari wrote: @ Olivier,
Are you sure the diameter of a Ball is 1.9mm?