IWC Ingenieur International Watch Schaffhausen Cal.853 Stainless Steel Screw Down Back Large 37MM Swiss Made One of the first Cal.C853 ever was made. Movement number it is from 1958 , but IWC introduced Movement 853 just in on the Basel Watch Exhibition jus in 1959 , that means that this watch was one of the first Ingenieur Watch made by IWC .On the movement: PAT. APPL. C 853 21 JEWELS SIGNED: INTERNATIONAL WATCH Co. SWISS on movement and on automatic swing.Inside back cover:STAYBRITE*STEEL*INTERNATIONAL WATCH Co. SWISS (IWC logo) In Great Working Condition, Keep Very Accurate Time. Just recently was serviced. Please have a look at our vintage watches we have constantly listed on Chrono24.