Rolex Oyster, "Royal", very rare two-tone silver 24 hour dial, circa 1930s.
It has a silver two-tone base with embossed applied indexes at 3, 9, 12 and cannonball indexes on the rest, red printed 24-hour notation, black printed railtrack, a very rare and elaborate construction. The ivory color has a wonderful vintage taste. The case size is 30mm, but the precious big crown gives it a presence beyond its size.