Approx. Ø60mm, approx. 163g, silver, early version me hinge back, No. 200356, case and work number equal, large chronometer unruly, anchor movement with power reserve, silver dial, steel hand, unpolished original condition, manageable. The series production of the B-watches begins at A. Lange & Söhne in October 1940 with factory number 200,000. This number 200356 probably dates back to the first production year 1940 and is one of the earliest marine observation watches of Lange & Söhne and this in an unrestored original condition!