This uncoated lens came from the Leitz Aristophot 4x5" (9x12cm more precisely) photomacroscopic stand, type I mostelikely since they are the brass version. http://www.macrolenses.de/ao_detail.php?AdonsNr=200 showing also the fitting condensers etc. (Thanks to Dr. Klaus Schmitt for the input).
Good used condition.
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