I have two of these, both in Copal shutters,
One is in new condition, absolutly mint: 750 euro
one in good condition with some cosmetic sight of use: 700 euro
both lenses are Rodentsock Apo Sironar Digital 55 mm lenses, selected by Sinar, as Sinaron Digital,
they are calibrated at Rodenstock for best performens.
The lens can be used at all camerasystems, mostly no recessed board is needed, the simply flat.