55/1,4 Cosinon Auto
This lens is known as Cosinon, Tominon, Porst and many more names.
AFAIK, it's made by Tomioka.
My copy was built like a tank, pretty the same style as M42 screw mount Takumars.
Not as good as i.e. 50/1.4 Tak - quite soft at full aperture, although stepped down - VERY sharp.
The transmission of the lens is not as good as in Takumar (worse coating?) so at f 1.4 it was no "faster" than my Helios 58/2 at f2.
I've sold it after acquiring Super Takumar 50/1.4.
Nevertheless, VERY nice lens.