Leitz Summar 2/42mm Lens for Aristophot

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 condensors etc.
(Thanks to Dr. Klaus Schmitt for the input).

Good used confition.