Rolex, Oyster Perpetual,  Superlative Chronometer Officially Certified, Ref. 1012. 14K yellow gold with a Rolex buckle. 

Case. Three-body, solid, polished and brushed, screwed-down case with original crown.

Dial. Silver with applied yellow gold bâton  indexes and tritium dots. Tritium-coated yellow gold baton hands.  

Movement . Cal.1560, rhodium plated, 25 jewels, straightline lever escapement, monometallic balance adjusted to temperatures and 5 positions, self-compensating free-sprung Breguet balance-spring, Microstella regulating screws.

Serial Nr. 856XXX

Diameter 36mm

More about Rolex:

The Rolex reference 1012  was made exclusively in gold and in very small production between the late 1950's and early 60's. The watch was produced with different dials and hands, a silver or gold dial, and dauphine or baton hands. The reference 1012 was among the early modern oyster perpetual references made after production of the bubble backs and Bombay was discontinued. It was Rolex answer to the practical dress watch produced by the other Swiss manufacturers like Patek Philippe with its 2526 and Vacheron Constantin with its Chronomètre Royal. These automatic dress watches with dauphine hands and luminous dial were produced in very small quantities during the same period.