This watch was produced in three limited series as follows: - 1000 examples in yellow gold (0-999) - 1000 examples in pink gold (0-999) - 100 examples in platinum (0-99)These watches are delivered with the Chronometer Warranty by the Official Swiss Chronometer TestingInstitute (COSC).The coaxial escapement one of the major horological inventions of the 20th century eliminates practically all friction between the pallet wheel and the pallets which had long been a source of lubrification problems in mechanical watches. The result is a movement with a longer lifetime and increased accuracy.