1938 Rolex Rare Oyster "Centregraph" with Gayfreres Bracelet

Rolex Oyster, Zerograph, "Centregraph", water-resistant, circa 1938.

This is the first water-resistant chronograph made before the early waterproofed chronographs such as Ref.3525 and Ref.3668 were introduced. It is a rare piece that was produced for only a few years in the late 1930s as a waterproof watch specialized in stopwatch functions such as flyback function and measurement up to 12 hours by setting the hour and minute hands to exactly zero. The matte white dial with a red second hand shows "ROLEX OYSTER" in an arched shape, and the turned bezel Oyster case with a mid-crown is reminiscent of the Oyster case of the same age. It comes with a precious Gayfreres expansion straight bracelet (for wrist sizes up to 20.5 cm).