Maker Emil Busch. Made from the Preussian period up to the ROIA period. Seems to be a Petzval with tangential adjustment of the FRONT cemented pair. Looks odd with a tangental focussing drive on the sleeve and a radial drive on the barrel. I enclose documentation from the European "glamour" auction site that sold the grubby one in 2007 and has the cleaner, late version, in an auction in May. I have no connection with the auction house - and probably never will have - as the 20% fee ires me! Could the Nicola Perscheid adventure be based on previous interest? Can't find a catalogue that has it.
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