{"id":28492,"date":"2019-02-17T06:00:10","date_gmt":"2019-02-17T14:00:10","guid":{"rendered":"https:\/\/www.bobswatches.com\/rolex-blog\/?p=28492"},"modified":"2023-07-03T12:05:17","modified_gmt":"2023-07-03T19:05:17","slug":"rolex-kew-observatory-certificate","status":"publish","type":"post","link":"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-kew-observatory-certificate.html","title":{"rendered":"Rolex, the Kew Observatory, and the “A” Certificate"},"content":{"rendered":"\n

Today, the Kew Observatory (also known as the King\u2019s Observatory) sits on the grounds of a private golf club in Richmond Upon Thames in London, England. It is no longer accessible to the public, and the closest you can get to it is catching a glimpse through high metal gates.<\/span><\/p>\n\n\n\n

During its heyday, however, the Kew Observatory was a hub of activity. It was initially constructed in 1769 for King George III to view the passage of Venus across the face of the sun. In the following century, the building housed the National Physical Laboratory, which was in charge of testing timepiece movements – and this is where the Kew Observatory played a significant role in the history of the Rolex collection<\/a>. <\/span><\/p>\n\n\n

\n
\"Kew
Today nearly every watch in Rolex’s catalog proudly displays the “Superlative Chronometer Officially Certified” text on its dial as a symbol of its precision timekeeping ability.<\/figcaption><\/figure><\/div>\n\n\n

The Kew Observatory “Class A” Certificate<\/b><\/h2>\n\n\n\n

Marine chronometers were essential to marine navigation because they could help determine a ship\u2019s position (longitude) by way of celestial navigation. Invented by John Harrison in 1761, the marine chronometer became the gold standard in precision timekeeping. In fact, marine chronometers were essential to the rise of the United Kingdom\u2019s Royal Navy, which was the world\u2019s most powerful navy from the mid-18th century until WWII. <\/span><\/p>\n\n\n\n

A one-second deviation in timekeeping translated to a positioning error of around 500-meters per day – so it was imperative that these nautical tools keep accurate time to ensure safe seafaring. Observatories all over Europe were tasked with testing marine chronometers but none came close to the demanding criteria of the Kew Observatory \u201cClass A\u201d Certificate. <\/span><\/p>\n\n\n\n

To gain a “Class A” Certificate from the Kew Observatory, a timepiece was subjected to 45 days of tests (compared to the Swiss standard of 15 days of testing) with a precision tolerance of a few seconds per day. Plus, it had to be tested in five different positions and at three different temperatures. <\/span><\/p>\n\n\n

\n
\"Kew
First introduced in 1988, the Caliber 3135 movement has served as the heart of many Rolex watches throughout the years.<\/figcaption><\/figure><\/div>\n\n\n

The First Rolex to Get a Kew “Class A” Certificate<\/b><\/h2>\n\n\n\n

In the first decade of the 20th century, a truly reliable and precise wristwatch was still nonexistent. So, to give legitimacy to his small wristwatches in a world where pocket watches and marine chronometers reigned supreme in the precision department, Rolex\u2019s founder, Hans Wilsdorf set out on a chronometer certificate mission. <\/span><\/p>\n\n\n\n

In 1910, a Rolex wristwatch was the first in the world to attain the Swiss Certificate of Chronometric Precision in Bienne. Yet, Hans Wilsdorf had his eye on a bigger prize – the Kew test. <\/span><\/p>\n\n\n\n

Four years later, Rolex sent a small ladies’ wristwatch to the Kew Observatory for testing and it was awarded the “Class A” certification on July 15, 1914. It was the world\u2019s first wristwatch to do so. <\/span><\/p>\n\n\n

\n
\"Kew
Certain older watches such as the reference 5513 Submariner were not chronometer-certified, and consequently do not have the additional lines of text on their dials.<\/figcaption><\/figure><\/div>\n\n\n

The “Kew A” Rolex Watches<\/b><\/h2>\n\n\n\n

Receiving the Kew A certificate in 1914 was certainly a momentous milestone for Rolex. However, that piece not only housed a specifically designed movement, but it was also a ladies\u2019 wristwatch. Therefore, over the following decades, Rolex sought out to attain Kew certifications for serially produced movements. After all, the goal was to position the company as one that could produce chronometric wristwatches (for men and women) on a bigger scale. <\/span><\/p>\n\n\n\n

According to author and Rolex historian, James M. Dowling, Rolex produced 145 movements over four years (late 1940s – early 1950s) to submit to Kew testing. Only nine did not pass, and the remaining 136 watches all received the Kew “Class A” certificate. The author maintains that of these 136 Rolex watches, there were 112 steel Speedking models in “boy’s size” and 24 larger 18k gold models. Characterized by “KEW “A” CERTIFICATE” text on their dials, these ultra-rare vintage Rolex timepieces are seldom seen out in the wild.<\/span><\/p>\n\n\n\n

These days, Rolex watches are famously chronometer-certified by the COSC in Switzerland, in addition to Rolex’s more stringent, in-house ‘Superlative Chronometer’ testing. However, it’s important to remember that the English Kew Observatory was an early and important stepping-stone in Rolex\u2019s lifelong quest to make the most precise mechanical wristwatches possible.<\/span><\/p>\n\n\n

\n
\"Kew
The movement inside a vintage Rolex Oyster Chronograph ref. 5034<\/figcaption><\/figure><\/div>","protected":false},"excerpt":{"rendered":"

Today, the Kew Observatory (also known as the King\u2019s Observatory) sits on the grounds of a private golf club in […]<\/p>\n","protected":false},"author":19,"featured_media":7449,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[1630],"tags":[],"ppma_author":[2293],"acf":[],"yoast_head":"\nRolex, the Kew Observatory, and the "A" Certificate - Bob's Watches<\/title>\n<meta name=\"description\" content=\"Possibly the most important certificate of chronometric precision from Rolex's history is the \u201cClass A\u201d certificate from the Kew Observatory in 1914.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-kew-observatory-certificate.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rolex, the Kew Observatory, and the "A" Certificate - 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