Recently got this little guy off eBay. It was in dire need of tender loving care....after some basic cleaning and TLC, this new acquisition turned out to be a great lens. Its really tiny for a 135mm lens (the littlest 135 that I have ever used). What has me really stumped is that the lens has only 5 bladed aperture, where all the information points to this lens having 7 blades. Maybe a prototype?
(Its M42 / Edixa mount)
If anyone has any knowledge about it, please step forward! 
Anyway, here is the lens, and some sample pictures from it.
Steinheil Munchen 135_SNXT7209
Steinheil Munchen 135_SNXT7200
5 Bladed Aperture:
Steinheil Munchen 135_SNXT7205
Did I mention it was little?
Shoulder to shoulder with Vivitar S1 200mm & 135mm
Steinheil Munchen 135_SNXT7213
Steinheil Munchen 135_SNXT7215
With XF 35mm:
Steinheil Munchen 135_SNXT7216
Sample images (All shot in jpeg, minor pp and sharpening for web)
Steinheil Munchen 135_SNXT7161
Steinheil Munchen 135_bw_SNXT7231