The first generation of Rolex Day-date Ref.6511 Replica Watches are equipped with themovement Cal.1055 based onthe transformation ofthe movement Cal.1030calendar week assembly.The second yearin1957, the movement escalated into Cal.1055B, using Microstella balance wheel, which isonce again the exclusive patent used in the Rolex Day-Date watches.
You may not be familiar with the Microstella balance wheel. Bluntly speaking, Microstella balance wheel is “non-screw tuning”, Swiss Patent No. CHX2239668. Day-Date Replica Watches upgrades the first generation after the transformation and now they are more powerful, accurate. It can even ensure that a margin for error is within three seconds.
In the watchmaking history, the watchmaker can award their own chronometer certificates, which is apparently not real for the truth. To ensure the quality, Rolex gets its watches certificated by the authority regardless of the cost and the required extra time. To distinguish the original ones and later watches, in the late 1930s, Rolex changed chronometer engraved on the dial into “Officially Certified Chronometer”.