The album, full of excellent photos mostly private photos and intact nothing missing, the owner had taken time to lay it out well and to be very art deco in his decoration and script. This came from a dealer. The rangefinder is a Kdo36, this was replaced by the 40 a larger and more complex device, radar prediction replaced but did not do away with optical rangefinding completely. Two optical collectors I know have working examples of the Kdo 40's which can track a modern 747 with ease. The rangefinder had to be exactly positioned in relation to the guns so when a firing solution was given it took into consideration the exact position of the guns it was directing so no error occurred. High-quality gear, working examples of the rangefinders are quite rare museum pieces really, the optical devices which were mounted on them still good today but intact working examples which idiots have not tried to open " to see how they work", using nothing better than knives, forks and screwdrivers " from the garden shed" simply because they were " interested" and had nothing to do on a Sunday afternoon..... don't talk..... maddening.