Pancolar 50mm 1.7 lens???

[vimwiz]

Maybe some off-label run? Ive seen a Zeiss branded lens like this on a 70s Praktica camera. in M42.

 

[vintagesnaps]

Yeah I think Zeiss made lenses in screw mount that would fit Prakticas; I've seen it called M42, or Pentax screw mount, or - something else that I can't think of at the moment. Apparently the Pancolar the OP has must have been made by the company that Dennis found info. about.

 

[compur]

Zeiss made many M42 lenses starting from the late 1940s. The first prism type 35mm SLR was the Zeiss Contax-D (aka Pentacon and other names) in 1949 with M42 mount Zeiss lenses. Many more M42 Zeiss lenses and cameras followed.

My Zeiss/Voigtlander Icarex 35S TM sports a Carl Zeiss Ultron 50/1.8 with M42 mount:

Zeiss still makes M42 lenses as well as other mounts: link

 

[timor]

I think you're right Timor, I think Zeiss was making lenses to fit Exactas, etc. and in M42 not K mount.

There is also something else. Glass from Jena was always marked "Carl Zeiss Jena DDR" and later, after they gave up the trademark it was "Aus Jena". This lens looks to me like some Japanese make from gray market. Now I am curious if that lens has 6 elements, if so maybe not so bad lens. Pancolar apparently doesnt have a fixed configuration of the groups.
http://www.abload.de/img/651_pan5018_1_mg_9687_ef21.jpg
https://i0.wp.com/dl.dropbox.com/u/1273830/CameraJunky/Pancolar/pancolar_sema.png
http://www.abload.de/img/651_pan5018_2_mg_9688_xlnt.jpg
http://www.abload.de/img/651_pan5018_3_mg_9689_gdga.jpg