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I cannot find any online reference at the moment but I'm sure an earlier version was often seen on pre war Bessa 6x9 cameras along with the usual albada viewfinders of the period.
Voigtlander were...

Sir Howard Grubb's sight has its design origins in the Voigtlander "Kontur" camera viewfinder, although I am unsure which came first. My money would probably be on the Voigtlander given their...