Hi Francesco,
I have a Leica III chrome (# 200189 from 1936) with a Summar 5 cm 1:2 lens if you're interested?
It's a beautiful lens, with a style like images from before WWII!
I also have a Leica M4-2 (# 1503752) with grip. It's a black body with signs of wear but working perfectly.
Both cameras are serviced in 2002.
Maybe not the best offer you had, but I would love to work with a 8x20" camera. ;-)
I think I have a lens wide enough for this camera.