I recently purchased a "well used" RB 90mm C lens to go with the "well used" 50mm C lens that came with the "well used" RB67 body, back and WLF that I purchased earlier this year.

This set of equipment isn't pretty, and some of the functions are clearly quite worn (e.g. the pop-up magnifier in the WLF is hard to pop up).

The lenses though seem to resolve incredible amounts of detail, and the contrast is very consistent.