The Nikon S, was made available early in 1951; it is a Nikon M with flash sync contacts, two sockets at the upper left-hand edge of the body. All cameras sold with this feature are considered a Nikon S by the factory, even if marked M. Despite its shortcomings, the Nikon S sold well, and became the first Nikon on the US market. By chance, a number of Nikon S cameras have one more serial number digit, known as the 8-digit Nikon S. When reaching 6099999 the engraver continued at 60910000, but it was soon realized that the long serial number was impractical, and after some 1200 cameras, the numbering reverted to 6100000. The 609 prefix refers to the date the design was approved in September 1946.
This is a USED camera and lens. There are small marks on the body and signs of age. The lens looks clean and clear or haze, fungus, spots, etc. Shutter seems to sound correct, but we do not have the equipment to verify.