Beselers
During my research prior to the buying of an 67SC Beselr, I got this info that might be useful for you
Beseler made several different variations of the 67 lamphouse on the 23C chassis, with small differences between them. First there was the 67CS/67CS-XL. This was the basic model - 67 lamphouse mounted on the 23C type dual rail chassis, with the head was fixed in position. Following that, there was the 67SC/67SD, which was essentially the same enlarger, but with a mechanism added allowing the lamphouse to rotate for wall projection. And there was also the 67CS2-XL that had lens stage mechanisms for lens stage tilt and shift, which, with the tilting head, provided full controls for distortion correction.
Laf