I am selling my wonderful Rodenstock HR Digaron-S 28mm f4.5 in Copal 0 and helical focus mount (the latter is currently unmounted). The lens is in LN conditions, currently mounted on a Linhof board (I am using it on my Techno), and comes with all its original packaging & papers. I will throw in a Silvestri bayonet and the Linhof board for free as well (unless you specifically don't need it).
Best lens+focus mount price I found is 4,396.00 Euro (without adding the Techno board & the Silvestri bayonet, of course), my asking price is 3.500 Euro packed and shipped worldwide via trackable courier (UPS or similar).
Some quickly shot images of the lens, box, caps & helical mount: