0mm if lack of spring, balance and escape wheel and other important parts.

In 1980s, there was once an ultra-thin movement of only 1.2mm at thickness. But most of bearings of the gear were replaced by 13 ball bearings. Though it was relatively thinner, it subjected to high breakdown rate and difficult maintenance as it was not completed by traditional watch-making technique. The best solution was to send to original factory for service though it costed much more expensive.

Audemars Piguet Cal.2003 and Vacheron Constantin Cal.2003 are the same movement developed by Audemars Piguet and Vacheron Constantin and produced by Jaeger-LeCoultre . It is said that Cal.2003 is an Jaeger-LeCoultre movement. It is very unfair. As known to all, Audemars Piguet and Vacheron Constantin are both large shareholders of Jaeger-LeCoultre. What is more, only Audemars Piguet and Vacheron Constantin use, 14k gold watch
, this movement up to now.

This excellent movement is ultra-thin, reliable and easy to care. It is so classic that it is often applied in skeleton watches, coin watches and gilded watches. Though ultra-thin movement, 14k gold watch
, is not regarded as, 14k gold watch
, mainstream, it is worth collect carefully as it is exquisitely made.

The Audemars Piguet skeleton watch sports the 14K-gold-made Cal.2003. Normally the movement is crafted from alloy steel and then receives plating treatment.

Therefore, the 14K-gold-made movement is rare. This Audemars Piguet also sports 18K gold net strap and Shanghai turtle bezel.

The Vacheron Constantin skeleton watch, equipped with Cal.2003, is also very special. The movement adopts normal design.The front looks beautiful, you can see the gear cluster and the operation of escape wheel and balance. This model reverses the movement by 180 degrees and arranges the pin at the center of the movement through the conversion of gear.

Then it not only offers the beauty of movement operation but also reading of time. The gilding plate bears hand-engraved exquisite patterns and Geneva logoes. It is proved that this movement is of first-class craftsmanship.

Most of Audemars Piguet Cal. 2003 and Vacheron Constantin Cal.2003 are rhodium plated and has Geneva waves and scaly figure and 7 rubies. In earlier years,, 14k gold watch
, they were not equipped with anti-shock mechanism.

Later, they were equipped with KIF anti-shock mechanism, blued steel or alloy steel hairspring, alloy steel balance with make-up screws, 7-ruby-bearing and 5-direction test timing. They beat at 18000 vibrations, 14k gold watch
, per hour with a, 14k gold watch
, thickness of of 1.65mm and a diameter of 21mm.

Source: ezinearticles.com