carl zeiss jena II 28 mm 2.8

Hola!
Today i've seen a very strange carl Zeiss Jena lens.

The model was: carl Zeiss Jena II 28 mm 2.8.

The body of this lens is not like the classic body of a Carl Zeiss Jena.

It looks as a "modern" lens like a Canon FD or Pentax SMC for example...

I believe,but i'm not sure,that the lens was this:
http://www.menfis-and.com/index.php?act=viewProd&productId=2592

Do you know something about it?...is it a good glass?thanks

They outsourced some stuff to Japan in their late years. I know they made the 29mm wide-angle and it was spectacular. I think this 28 is made by someone else.

And you can see the "Made in Japan" markings on the lens. That looks to me to be the Olympus OM mount.