1930s steel vintage Rolex Oyster watch

A rare 1939 stainless steel vintage Rolex Oyster wristwatch. The case measures 31 mm in diameter, with Rolex Oyster crown. The case is signed Oyster Watch Co., Geneva Swiss, and numbered 76772 to the back. The Rolex Ultra Prima movement is signed Rolex Chronometer, Swiss Made, with 17 rubies, timed to 6 positions, with a patented flexible suspension wheel. The silvered dial has raised gilt Arabic numerals with subsidiary seconds and fine blued steel hands. The dial is signed Rolex Oyster above the centre.