Aici gasisem un articol in care zice ca rotile cica ar fi din glucydur :
http://www.svetsatova.com/forum/f116/po ... -6949.html "...Picture 3 shows the complete train and the escapement. Nothing fancy there, just overall good basic engineering. Note that the wheels are made of glucydur and the pinion leaves are made of steel. Dissimilar metals rolling together produce considerably less friction than if they were made of identical material. All the wheels in quartz watches, high grade ones included, are made of brass. Due to the fact that there is much less torque in a quartz movement, there is no need for the greater strength of the glucydur wheels... "