Rodenstock Sinaron S 210mm f5.6 in Copal 1.
Excellent condition, very few signs of use, shutter in perfect working order.
As far as I know this lens is the Sinar branded version of the APO Sironar N (white ring) which should be on par with SK APO-Digitar 210mm.
SOLD!
I'm a long time member of this forum so buy with absolute confidence. I have sold many high ticket items here.