{"id":179023,"date":"2026-05-13T16:44:39","date_gmt":"2026-05-13T14:44:39","guid":{"rendered":"https:\/\/lionel-meylan.ch\/actualite\/certification-or-the-quest-for-ultimate-precision\/"},"modified":"2026-05-13T16:44:39","modified_gmt":"2026-05-13T14:44:39","slug":"certification-or-the-quest-for-ultimate-precision","status":"publish","type":"blog","link":"https:\/\/lionel-meylan.ch\/en\/actualite\/certification-or-the-quest-for-ultimate-precision\/","title":{"rendered":"Certification or the quest for ultimate precision"},"content":{"rendered":"<p class=\"drop-cap\">What<strong>good is a watch if it doesn&#8217;t deliver precision <\/strong><strong>? <\/strong><br \/>\nIn this respect, a number of brands are determined to prove that their mechanical jewels are only as good as their precision. At their disposal is the Contr\u00f4le Officiel Suisse des Chronom\u00e8tres, a venerable institution whose creation dates back to 1876. Its role? As a neutral, independent body, the COSC issues a chronometric precision certification based on an international standard stipulating a fifteen-day test protocol covering seven criteria. In the end, the rate deviation for a mechanical movement must not exceed the daily values of -4 to +6 seconds per day. If this is the case, it enters the pinnacle of precision watchmaking. Approximately 1.7 million pieces a year are awarded the precious label, representing a fifth of Swiss mechanical watch production. Only a handful of watch brands use the COSC service, with the top four being Rolex, Omega, Tissot and Breitling, which together account for over 80% of the watches bearing this certification.       <\/p>\n<p>&nbsp;<\/p>\n<p class=\"p2\"><b>IN EXTREME CONDITIONS<\/b><\/p>\n<p class=\"p2\">Breitling is the only Swiss brand to have all its watch movements COSC-certified, including that of the Superocean 44 Special Blacksteel, which is designed for the abyss and guaranteed water-resistant to 1000m.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-72673\" src=\"https:\/\/lionel-meylan.ch\/wp-content\/uploads\/2025\/08\/superocean_44_special_blacksteel-265x400..jpg\" alt=\"\" width=\"265\" height=\"400\"><\/p>\n<p>&nbsp;<\/p>\n<p class=\"p2\"><b>WITH FINESSE<\/b><\/p>\n<p class=\"p2\">A tribute to the very first L.U.C watch to come out of Chopard Manufacture in 1986, this COSC-certified L.U.C XPS 1860 bears the Poin\u00e7on de Gen\u00e8ve in its rose gold version, a guarantee of quality construction and finish.<\/p>\n<p>&nbsp;<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-72675 aligncenter\" src=\"https:\/\/lionel-meylan.ch\/wp-content\/uploads\/2025\/08\/luc_xps_1860__1_6896-400x320..jpg\" alt=\"\" width=\"400\" height=\"320\"><br \/>\n<figure id=\"attachment_72676\" aria-describedby=\"caption-attachment-72676\" style=\"width: 283px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-72676\" src=\"https:\/\/lionel-meylan.ch\/wp-content\/uploads\/2025\/08\/luc_xps_1860__161946-5001_6882-283x400..jpg\" alt=\"\" width=\"283\" height=\"400\"><figcaption id=\"caption-attachment-72676\" class=\"wp-caption-text\">L.U.C XPS 1860<\/figcaption><\/figure><br \/>\n&nbsp;<\/p>\n<p class=\"p2\"><b>ANTIMAGNETIC<\/b><\/p>\n<p class=\"p2\">With its calibre 8900 with coaxial escapement, this Omega Seamaster Planet Ocean 600 M is Master Chronometer certified, and therefore resistant to magnetic fields equivalent to those of an MRI (\u00b1 15,000 gauss) with a precision tolerance of between 0 and +5 seconds over 24 hours.<\/p>\n<p><figure id=\"attachment_72681\" aria-describedby=\"caption-attachment-72681\" style=\"width: 400px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-72681 size-medium\" src=\"https:\/\/lionel-meylan.ch\/wp-content\/uploads\/2025\/08\/21532442101001-20-large-400x225..jpg\" alt=\"\" width=\"400\" height=\"225\"><figcaption id=\"caption-attachment-72681\" class=\"wp-caption-text\">OMEGA SEAMASTER PLANET OCEAN<\/figcaption><\/figure><br \/>\n&nbsp;<\/p>\n<p class=\"p2\"><b>ALWAYS MORE<\/b><\/p>\n<p class=\"p2\">Certified as a Superlative Chronometer, the Oyster Perpetual Rolex Deepsea is water-resistant to 3900m and meets criteria stricter than watchmaking standards, i.e. guaranteed precision with a tolerance margin of -2\/+2 seconds per day.<\/p>\n<figure id=\"attachment_72682\" aria-describedby=\"caption-attachment-72682\" style=\"width: 400px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-72682\" src=\"https:\/\/lionel-meylan.ch\/wp-content\/uploads\/2025\/08\/rolex_deepsea_116660a_amb-400x300..jpg\" alt=\"\" width=\"400\" height=\"300\"><figcaption id=\"caption-attachment-72682\" class=\"wp-caption-text\">ROLEX DEEPSEA &#8211; 904L STEEL<\/figcaption><\/figure>\n<p class=\"p2\"><b>Labels, everyone&#8217;s business&#8230; or almost<\/b><\/p>\n<p class=\"p3\">On the face of it, the Swiss Made appellation of origin and the COSC precision certificate might be enough to guarantee the quality of Swiss timepieces. But some have decided to go even further, subjecting finished watches to a battery of tests and constraints. Here&#8217;s a selection of the most demanding certifications:  <\/p>\n<p class=\"p4\"><i>The Geneva Seal<\/i><\/p>\n<p class=\"p4\">Introduced into Geneva cantonal law in 1886, essentially as an anti-counterfeiting weapon, it is one of the most uncompromising labels in the industry. It goes beyond movement certification to label the excellence of the watchhead. <\/p>\n<p class=\"p4\"><i>Fleurier Quality Label<\/i><\/p>\n<p class=\"p3\">Dating from 2001, it requires COSC and Chronofiable ageing tests, a registered trademark since 1985.<\/p>\n<p class=\"p4\"><i>METAS certification<\/i><\/p>\n<p class=\"p3\">More recently, Omega introduced a new Master Chronometer certification developed in collaboration with the Swiss Federal Institute of Metrology. In addition to a COSC-certified chronometer movement, the water-resistance and non-magnetism of the finished watch are guaranteed. <\/p>\n<p class=\"p4\"><i>Brand labels<\/i><\/p>\n<p class=\"p3\">1000-hour Master Control for Jaeger-LeCoultre, Poin\u00e7on Patek Philippe, Superlative Chronometer for Rolex&#8230; As a guarantee of quality, reliability and precision, some watchmaking companies have created their own labels.<\/p>\n","protected":false},"template":"","blog_category":[484],"class_list":["post-179023","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-passion-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Certification or the quest for ultimate precision | Lionel Meylan<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lionel-meylan.ch\/en\/actualite\/certification-or-the-quest-for-ultimate-precision\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Certification or the quest for ultimate precision | Lionel Meylan\" \/>\n<meta property=\"og:description\" content=\"Whatgood is a watch if it doesn&#8217;t deliver precision ? 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