The Patented Crown
During the development of our new crown we had to face the fact that literally every current crown system that works on a basis of a decoupling screw-down crown has two major weak spots that may sooner or later result in a defect.
The reason for that is to be found in the positive-fit
coupling elements of the crown. They often consist of a fairly weak hexagon
bolt which with1mm width across flats. Another reason for a defective
crown mechanism is the wrong choice of material. Most watch manufacturers
still make use of brass, German silver, or rather soft stainless steel
(see “The Watch Case”). this leads in many cases to chamfered
corners of the hex bolt which makes a form fit almost impossible. In such
a case you would neither be able to wind the movement by hand nor to set
the correct time.
After extensive research we developed a decoupling screw-down
crown which is constructed according to standards derived from mechanical
engineering. The use of a hex bolt with 2mm width across flats and the
fact that the entire crown, including shaft, thread etc. is made from
our patented hardened steel (60-62 HRC) results in a longevity which is
second to none.
Our new crown system is patented.