This is a 203mm f7.7 coated Ektanon (same as Ektar) barrel lens mounted on a Graflex "B" board for the 4X5 Graflex Super D or Series B. Serial # of lens is RC 372 which I believe puts the year of manufacture at 1951. Glass is in very good condition and iris opens and closes smoothly. Apertures are marked on barrel and because it is mounted on a board for the Super D I put the aperture markings also on the front of the lens for ease of use. A classic very sharp lens great for portraits - do a google to read up on these great lenses. Superb for the Super D. $99.00 OBO plus shipping of $12 to USA and Canada. Paypal only.