I don't have the Zeiss specs but the B&L will be close enough. According to the B&L listing what you have is the No. 15 Convertible Protar consisting of a 23 1/4" and a 16 3/16" cells. Together they form a focal length of 10 7/8", max aperture of f/7.7, coverage at small apertures for a 10"x12" 'plate'.

Hope this helps. Have fun!