Audemars Piguet developed ultra-thin manual winding movement with a thickness of 1.65mm. This movement, the thinnest in the world at time, really made a hit. Up to now, this record has not been broken by any movement that made by traditional watch making technique. Now , thanks to the improvement of, 14k gold watch
, quartz watch technique, the thickness of movement may be less than 1.
0mm if lack of spring, balance and escape wheel and other important parts.