Collecting Military Binoculars
12 x 24 "Trieder Binocle 12x" Goerz Berlin 1899
The Trieder series (3X, 6X, 9X, and 12X) were the first porro prism binoculars Goerz made, the model being manufactured from 1897 - 1911.
The distance between the eye pieces can be adjusted by turning the single wheel. (foto 3)