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.
Many watch manufacturers seem to be aware of this problem and use an inferior
coupling crown which is permanently connected to the movement.
The wrong choice of materials described above also sometimes results in
ruined and worn out threads of the crown mechanism which also impacts
the water resistance of the watch.
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.
All gaskets of the new crown system are made of Viton™, a material
with high chemical and mechanical resistance which is superior to every
other gasket material (Nitril etc.) currently used in wrist watches.
Crown and pushers are also equipped with our patented lubrication cell
which ensures a smooth action and lubricates the shaft and the gasket.
The tubes of both crown and pushers are, according to industrial engineering,
screwed into the case using a special key. Almost every other watch manufacturer
makes use of an inferior press fit tube.
Our new crown system is patented.
