A 5-element Karat Xenar 5cm F2.8, coated optics. WW-II vintage.
Scheider Xenar 5cm F2.8 by fiftyonepointsix, on Flickr
I converted it to Leica mount, the loose lens found at a Photorama show for $30.
Probably the only one.

I converted it to Leica mount, the loose lens found at a Photorama show for $30.
Probably the only one.