As we all know, now all the Oyster-style constant-action rolex replica watches are sophisticated timepieces replica rolex, the surface of the "official recognition of precision timepieces," the words will confirm this point, but also a symbol of the brand's excellent pursuit of excellent timing, so Rolex As early as the early 20th century has become a pioneer in precision watch research and development. In 1910, one of Rolex's watches became the first official watch in Switzerland. In 1914, a similar Rolex watch was awarded the "Class A" precision time certification by the famous Kew Observatory. Brand in the pursuit of precision timepieces in the process of all important moments, are fully explained the famous title of the meaning, and until about 1957, this title is finally finalized. From the beginning only "Chronometer" word to "Officially Certified Chronometer", and finally named "Superlative Chronometer Officially Certified". \ Definition of precision timepieces Let's revisit the definition of precision timepieces. The so-called precision timepieces, refers to the official certification of a high degree of precision timepieces, the daily time and the exact time deviation of less than a few seconds. At present, the men's mechanical watch movement of the maximum deviation is limited to four seconds a day or fast six seconds, the accuracy rate of 99.993%! This accuracy must be approved by independent agencies for 15 days and nights. Only the standard movement can be issued by the Swiss Official Chronometer Testing Center (COSC) issued a precision time certificate. \ Official certification Precision time itself will have the official certification of the meaning, why should particularly marked? Historically, the rules for "precision timepieces" have different rules, and the official definition was "a precision watch that was" enough to earn an official rating certificate. " Thus, the watchmakers can self-certification for the precision time, and this process is clearly the risk of fraud. In order to ensure the quality of precision timepieces, Rolex regardless of the cost and the additional time required, choose to watch the official certification. To mark this distinction, the brand in the late 1930s will dial the engraved words, from "Chronometer" to "Officially Certified Chronometer". \ "Extreme" accuracy In 1951, official certification became a mandatory standard. This is a victory for Rolex, because the brand since 1927 will produce the official identification of recognized precision timepieces, the ratio close to 90%. At the same time, each of Rolex watches are engraved with "Officially Certified Chronometer" words red paint seal. However, when the official certification to become a sales specification also makes the brand's precision time lost important advantages. As competitors continue to progress, Rolex then to strive for "superior performance certificate" (certificates of superior performance) as the goal to identify. According to the old rules, the accuracy of the movement in the test will be able to obtain a good certificate of "outstanding performance" of the certificate. In the early 1950s, Hans Wilsdorf, the founder of Rolex, was less determined to acquire the Excellence in Performance Certificate. In January 1959, he wrote: "We have reached a point where we have to get all the 'outstanding performance certificates'!" He summed up: "This Rolex's reputation can grow." Ultimately, an important innovation technology to achieve this goal. In 1957, Rolex launched a new generation of timing performance outstanding movement, called 1500-type movement, the assembly of gold fine-tuning screw balance wheel (now star-shaped fine-tuning nut replaced). Its precise timing results are three times higher than the standard for obtaining the certificate. To demonstrate this extraordinary character, Rolex also conceived the concept of "Superlative Chronometer". Pay tribute to the daily calendar type watch This name was later added to the lettering of the dial, combined into the famous "Superlative Chronometer Officially Certified". Although it did not bear a clear date, but believe that this update in 1957 in the prestigious Sunday calendar dial for the first time, and the watch was available the previous year. With the establishment of the Swiss Precision Timepiece Testing Center (COSC), the "Excellence in Performance Certificate" was finally discontinued in 1973. This organization brings together the official watch rating center, jointly set a new standard: movement test results only two, to achieve more stringent than the previous standard or not compliance. The same is true, however, that the title of Rolex is both a symbol of excellence and a testimony to the brand's pioneer in the field of precision timing.