The Nikon S4 is a 35mm rangefinder camera from Nikon's S-series, produced in the 1950s. The black-finish variant is far scarcer than the standard chrome version and is sought principally by Nikon rangefinder collectors rather than users.

Hammer prices for a black Nikon S4 sit at the very top of the S-series market: a single recorded UK auction result reached £4,792, reflecting the rarity premium black-paint Nikon rangefinders command. With only one verified sale in the data set, today's value for a comparable example is best treated as a guide price rather than a settled market median, and condition of the original black finish drives almost all of the variation in what one sells for at saleroom level.