{"id":36236,"date":"2019-08-19T06:00:10","date_gmt":"2019-08-19T13:00:10","guid":{"rendered":"https:\/\/www.bobswatches.com\/rolex-blog\/?p=36236"},"modified":"2023-07-03T13:39:46","modified_gmt":"2023-07-03T20:39:46","slug":"rolex-sigma-dial-definition","status":"publish","type":"post","link":"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-sigma-dial-definition.html","title":{"rendered":"What Is a Rolex Sigma Dial?\u00a0"},"content":{"rendered":"

Part of the fun of getting into the vintage Rolex collecting game is discovering all the various design details. And many of these details can be found on the watch dials. Today we explore the origins of the Rolex Sigma dial and what that can mean for the value of a vintage Rolex<\/a> watch.\u00a0<\/span><\/p>\n

\"rolex<\/p>\n

The Sigma Symbol and APRIOR<\/b><\/h2>\n

In the 1970s, a group of Swiss watchmakers who were part of the L\u2019Association pour la Promotion Industrielle de l’Or or APIOR (which translates to The Association for the Industrial Promotion of Gold) formed an official initiative to highlight the use of gold on watches.\u00a0<\/span><\/p>\n

Similar to how the \u201cChronometer\u201d designation was controlled and guaranteed by Contr\u00f4le Officiel Suisse des Chronom\u00e8tres (COSC) to denote optimal timekeeping precision, APRIOR wanted to formalize how watchmakers signified the use of precious gold in watches – especially important on steel watches since stainless steel and white gold are similar in color.\u00a0<\/span><\/p>\n

\"rolex<\/p>\n

The symbol chosen was the Greek letter Sigma: \u03c3. According to a US Patent Office Registration Certificate (filed in August 1971 and registered in July 1972) the \u03c3 mark \u201ccertifies that the goods are of Swiss origin and contain solid gold up to a certain standard as established by the Swiss statutory requirements concerning the control of the use of gold and meet standards and quality established by the applicant.\u201d It also mentions that the mark was \u201cFirst used February 25, 1970; in commerce on or about Mar. 1, 1970.\u201d\u00a0<\/span><\/p>\n

The Sigma mark could be used on the dial, bracelet, or caseback of watches to signify the presence of gold. Some famous watch brands that used the APRIOR Sigma mark included Patek Philippe, Vacheron Constantin, IWC, and of course, Rolex.\u00a0<\/span><\/p>\n

\"daytona<\/p>\n

Rolex and the Sigma Dial<\/b><\/h2>\n

Sigma dials can be found on Rolex watches dating from the early 1970s until the latter part of the decade; however they can sometimes be found on Rolex watches from the late 1960s, as the “Sigma” symbol was being used by certain dial manufacturers before it became officially adopted in the early 1970s . Rolex Sigma dials have two \u03c3 marks surrounding the \u201cT SWISS T\u201d signature just under 6 o\u2019clock marker on the dial (\u201cT\u201d refers to the use of tritium as luminescence on the dial). Therefore, Rolex Sigma dials denote that the hand-applied indexes and hands are craft from 18k gold.\u00a0<\/span><\/p>\n

Rolex Sigma dials are more often found on stainless steel models (as a way to differentiate between the steel case and bracelet and white gold details on the dial); however there are also examples of the Sigma dial on two-tone and yellow gold Rolex models.\u00a0\u00a0<\/span><\/p>\n

\"daytona<\/p>\n

We have seen Rolex Sigma dials on vintage Daytona, Date, Datejust, Day-Date, and Cellini watches. You will not find Sigma dials on models like the Submariner, Sea-Dweller, or Explorer from the same era since Rolex did not have gold surrounds around the painted tritium hour markers at that time.\u00a0<\/span><\/p>\n

Since Rolex only used the Sigma dial for a handful of years in the 1970s, it comes as no surprise that the small \u03c3 markings can add to the value of a vintage Rolex watches. Today, vintage Rolex Daytona chronographs with Sigma dials are particularly collectible, and run a premium when they surface at auction.\u00a0\u00a0<\/span><\/p>\n

\"rolex<\/p>\n","protected":false},"excerpt":{"rendered":"

Part of the fun of getting into the vintage Rolex collecting game is discovering all the various design details. And […]<\/p>\n","protected":false},"author":2,"featured_media":36238,"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":[2286],"acf":[],"yoast_head":"\nWhat Is a Rolex Sigma Dial?\u00a0 - Bob's Watches<\/title>\n<meta name=\"description\" content=\"You have probably heard the term before, and may have even seen the small Greek symbol on various vintage watches, but what exactly is a Rolex Sigma Dial?\" \/>\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-sigma-dial-definition.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is a Rolex Sigma Dial?\u00a0 - Bob's Watches\" \/>\n<meta property=\"og:description\" content=\"You have probably heard the term before, and may have even seen the small Greek symbol on various vintage watches, but what exactly is a Rolex Sigma Dial?\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-sigma-dial-definition.html\" \/>\n<meta property=\"og:site_name\" content=\"Bob's Watches\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/bobswatches\" \/>\n<meta property=\"article:published_time\" content=\"2019-08-19T13:00:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-03T20:39:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.bobswatches.com\/rolex-blog\/wp-content\/uploads\/2019\/08\/5D3_3601-copy.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1440\" \/>\n\t<meta property=\"og:image:height\" content=\"960\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Paul Altieri\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@bobswatches\" \/>\n<meta name=\"twitter:site\" content=\"@bobswatches\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Paul Altieri\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-sigma-dial-definition.html#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-sigma-dial-definition.html\"},\"author\":{\"name\":\"Paul Altieri\",\"@id\":\"https:\/\/www.bobswatches.com\/rolex-blog\/#\/schema\/person\/22b37643d599dce1a5947061baa91033\"},\"headline\":\"What Is a Rolex Sigma Dial?\u00a0\",\"datePublished\":\"2019-08-19T13:00:10+00:00\",\"dateModified\":\"2023-07-03T20:39:46+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-sigma-dial-definition.html\"},\"wordCount\":542,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\/\/www.bobswatches.com\/rolex-blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-sigma-dial-definition.html#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.bobswatches.com\/rolex-blog\/wp-content\/uploads\/2019\/08\/5D3_3601-copy.jpg\",\"articleSection\":[\"Resources\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-sigma-dial-definition.html#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-sigma-dial-definition.html\",\"url\":\"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/rolex-sigma-dial-definition.html\",\"name\":\"What Is a Rolex Sigma Dial?\u00a0 - 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His experience spans over 35 years and he has been published in numerous publications including Forbes, The NY Times, WatchPro, and Fortune Magazine. Paul is committed to staying up-to-date with the latest research and developments in the watch industry and e-commerce, and regularly engages with other professionals in the industry. He is a member of the IWJG, the AWCI and a graduate of the GIA. \r\n\r\nAlongside running the premier retailer of pre-owned Rolex watches, Paul is a prominent Rolex watch collector himself amassing one of the largest private collections of rare timepieces. In an interview with the WSJ lifestyle\/fashion editor Christina Binkley, Paul opened his vault to display his extensive collection of vintage Rolex Submariners and Daytonas. \r\n\r\nPaul Altieri is a trusted and recognized authority in the watch industry with a proven track record of expertise, professionalism, and commitment to excellence."}],"_links":{"self":[{"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/posts\/36236"}],"collection":[{"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/comments?post=36236"}],"version-history":[{"count":13,"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/posts\/36236\/revisions"}],"predecessor-version":[{"id":58024,"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/posts\/36236\/revisions\/58024"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/media\/36238"}],"wp:attachment":[{"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/media?parent=36236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/categories?post=36236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/tags?post=36236"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.bobswatches.com\/rolex-blog\/wp-json\/wp\/v2\/ppma_author?post=36236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}