I just picked up a nice Goerz lens marked C P Goerz Berlin ...Dopp Anastigmat Dagor 168mm f/6.8 #364230.

It's the first one I've seen marked both Doppel Anastigmat and Dagor. It also has the old Goerz aperture scale 4.5, 6, 9, 12, 24, 48, 96, 192, 384. Glass is in nice shape, in barrel. It came in a focusing mount which works pretty smoothly. I'll stick it on a board and fool with it in the next day or so. Focusing mount has the same serial number as the lens.

Anyone care to hazard a guess about when it was made?