USSR / Soviet - 1968 - Double-sided circular Slide rule – Mechanical Logarithmic Calculator used in pre-electronic era (in excellent condition / as new) *** NO RESERVE PRICE *** - marked: “МЛВКИ” ( Moscow Laboratory of Calculating & Control Instruments ) • Complete set with original box and instruction leaflet. - diameter: 50 mm - weight: 39.4 grams • It was designed for precise technical calculations and widely used in: - multiplication and division - ratio and proportional calculations - engineering and scientific work - military, navigation, artillery, and industrial applications * This circular logarithmic slide rule is often mistaken for a pocket watch due to its design * - case and leaflet in good condition with some signs of wear ( see photos for better impression as they are part of description ) - Shipping by Post: registered with tracking, will be sent in a cardboard box or an anti-shock bubble envelope. ( Livrare prin curier in Romania ) * If the automatic tracking system doesn't show info about your order, please see updates for your Tracking Number on your own country postal service * For EU buyers: please allow ca. 10 to 15 working days transit* time for the package to arrive, after is released by customs * For US and non-EU buyers: please allow ca. 15 to 25 working days transit* time for the package to arrive, after is released by customs * Transit time estimates: Sometimes the package arrives sooner than estimated and other times may be delays, please have patience. • If there is a problem, feel free to contact me before leaving feedback.