Carl Zeiss Jena Tessar 13,5cm f4,5

[Budweiser]

Good Day.
I have Carl Zeiss Photo Lens : Carl Zeiss Jena Tessar 13.5 cm f4.5 Nr. 2656187 (Contax Panflex, prototype), in a quite good condition.
I can not find any information, about that lens.
I wrote an email to Zeiss.de, and received answer:

"The offered Carl Zeiss Jena Tessar 4.5/13,5 with the serial number 2656187 was produced at the first quarter 1940.
The optic design of this lens was from 1927. Carl Zeiss Jena produced this lens type from 1927 since 1946.
Please look in the "Kadlubek's Lens Catalogue" for more information about the current price."

If anybody knows something about this lens, please answer...

Here are some real photos:

[skida]

[Budweiser]

Thank's a lot.
I didn't understand what's wrong...

[Orio]

What I can tell you is that your lens is a 1927 patent, and your copy was released as part of a lot of 3000
units on January 11th, 1940.
The lens is listed as made for " A, B, R u.C42 " camera. The exact meaning of the acronym is unknown to me,
but the presence of the letter C makes me suppose it might be a cine camera.
The B should probably stand for "bayonet", which is the case.