Know this is an old thread, but he has a extremely early Dagor. Goerz themselves said they had sold 30,000 by 1895 (!). and his serial number is below that. Since Goerz built other lenses besides the Dagor and probably used sequential serial numbers, his could be very early, like the first year of production. Interesting that they has Series III on it that early. Figured that didn't get engraved until after 1904.