Russian Balloon Theodolite by Aerogeopribor, c. 1940. Marked on the objectives "AEROGEOPIBOR", no. 1368. Black-lacquered metal, silver scales, 4 reading microscopes with micrometer adjustment, electric illumination, 3 bubble levels, right-angled telescope with prism, auxiliary telescope. Total height 20 ½ in. Start Price: EUR 280.