About Minus4Plus6.com

The name Minus 4 PLUS 6 is derived from the Contrôle Officiel Suisse des Chronomètres (COSC) standard deviation rate of -4 to +6 seconds within 24 hours, tested over a ten day period of chronometer testing, in five positions and at three temperatures. Watches that are within -4 to +6 deviation in a 24 hour period are awarded Official Chronometer Certification by COSC and the movement is engraved with a chronometer serial number. Rolex watches have a self-imposed stricter standard of -1 to +5 seconds per day and hence the designation, "Superlative Chronometer Officially Certified" on the dial. With 86,400 seconds in a 24 hour period (31,536,000 sec/year), a difference of +3 seconds per 24 hours is a deviation of 0.000035 (thirty five millionths) of its daily run resulting in 99.99% accuracy. The Rolex watch balance oscillates at a frequency of 28,800 times per hour which is equivalent to a car going 87 mph, and traveling a distance of 3,600 miles a year.

In 1910 Rolex sent their first movement to the School of Horology in Switzerland and was awarded the world's first wrist watch chronometer rating. Rolex founder, Hans Wilsdorf recognized two major requirements for watches: 1) To keep accurate time, and 2) To be reliable for which Rolex has been recognized for almost as long as watches have been worn. Rolex is sometimes referred to as the California Casio, the Texas Timex, and the Singapore Swatch. Despite these monikers, Rolex is the only watch manufacturer among the 100 most valuable brands in the world. Rolex is associated with people ranging from the Pope and Fidel Castro, Eric Clapton and the Dalai Lama, astronauts and presidents. Almost everyone is familiar with Rolex. For millions of people all over the world, the possession of a Rolex is a symbol of quality and precision.

This is a picture of a D series Rolex 16710 GMTII with the caseback removed. View the caseback removal process on YouTube or on the casebacks page. Rolex's movement beats at 28,000 oscillations per hour and the balance wheel oscillates 691,200 times per day!