![]() ![]() 1030 went through a number of variations. ![]() It found great success inside that era’s Submariner, Oyster Perpetual and Explorer range.įrom that basic, no date architecture, the Cal. This is a highly reliable and accurate 18,000bph mechanism. It marked the company’s first bi-directional self-winding movement. Rolex’s 1000 series of automatic calibers debuted in 1950, with the base model, the Cal. ![]() In the seventies, the 1500 series went through a similar process itself when Rolex superseded it with the 3000 range. Rolex have always preferred to gradually phase in replacements for their calibers, rather than with a sudden, jarring leap. By the late 1950's, Rolex launched a new generation of movements which were up to three times more precise than the criteria for obtaining a mention.The Rolex 1160 Caliber ran alongside the various iterations of the hugely popular 1500 series for a number of years. According to the old rules, movements whose precision proved superior in the tests received a certificate with the citation “particularly good results”. Rolex decided to differentiate itself by obtaining certificates avec mention (certificates of superior performance). In 1951, official certification became obligatory. ![]() To mark this difference, in the late 1930s, the brand changed the inscription on its dials from “Chronometer” to “Officially Certified Chronometer”. To guarantee the quality of its chronometers, Rolex made the choice to have them officially certified, in spite of the costs and extra time required. Historically, a watch could be designated as a chronometer by its own manufacturer to attest of its high precision, a process which obviously carried a risk of fraudulent abuse. "Superlative chronometer officially certified" ![]()
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