Rolex Oyster Chronograph watch, ref. 3525. Stainless steel case with screw-down back and crown. Attractive copper colored dial with two subsidiary dials, tachymeter, and telemeter scales. Serial number: 049019. Lacking band. The reference 3525 is an iconic Rolex; it was the first chronograph watch manufactured with a water-resistant oyster case. Its only 10 year run, starting in 1939, makes this a desirable vintage example.