Leica Summicron collapsible 5cm/2 'No.1' M39

the first Summicron ever made, delivered on October 31, 1952 to Alfred Boch, former head of the then Leitz agency in New York, from a small pre-series (922001-922097), still showing some significant differenes to the later series version, the latter commenced with ser.no´s 920001-922000, picture in the first Leitz new York Summicron brochure of May 1953, in beautiful condition, front lens with slight cleaning marks, slightly foggy inside; from the Dr. Luigi Cane Collection