Info on Enna Werk 35mm f2.5 Super-Lithagon Red "C" lens?

Came across a mint one for around $130. It's Exakta mount. Made in West Germany. It's a nice looking lens but it's hard to find info about them online. Only sparse sample shots here and there on Flickr.

Anyone got more info or sample shots from one? Overall thoughts on this lens? Does the red "C" have any significance?

Thank you.