The automatic, perpetual, or self winding watch is the favorite timepiece among collectors. The Oscillator or weight in the movement spins in a circular pattern to feed the mainspring and then follows the gear train to the balance, so time is regulated. In short an added step to the manual wind, making life easier in days of old. The majority of fine timepieces fall into this category. Shop for automatic watches
This caliber JLC 899 was found in a Jaeger-LeCoultre Master Control Date in 18K gold (reference 176.2.40.S aka Q1542520). Each caliber 899 is said to be tested rigorously for 1,000 before leaving the factory.