{"id":13445,"date":"2025-12-15T11:23:35","date_gmt":"2025-12-15T11:23:35","guid":{"rendered":"https:\/\/www.ephj.ch\/2025\/12\/15\/more-compact-px-calibres-transcend-the-spherillon\/"},"modified":"2026-07-14T14:38:33","modified_gmt":"2026-07-14T14:38:33","slug":"more-compact-px-calibres-transcend-the-spherillon","status":"publish","type":"post","link":"https:\/\/www.ephj.ch\/en\/2025\/12\/15\/more-compact-px-calibres-transcend-the-spherillon\/","title":{"rendered":"More compact, PX calibres transcend the Sph\u00e9rillon"},"content":{"rendered":"\t\t
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More compact, PX calibres transcend the Sph\u00e9rillon<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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The horological UFOs known as Sph\u00e9rillon\u2014a contraction of \u201csphere\u201d and \u201ctourbillon\u201d\u2014are undergoing a revolution: now more compact, promising additional functions, and even capable of evolving into automatic calibres. The most avant-garde watch brands are set to experience new, improbable thrills. Under the name PX, the art of the tourbillon enters a new dimension.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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At EPHJ 2025<\/strong><\/p>\n

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First unveiled in Geneva in 2022 at the high-precision trade show by\u00a0Purtec<\/strong>, the company of \u201ccrazy movements\u201d founded in 2021 in Vallorbe by Arnaud Faivre and integrated into the Tec-Group Swiss, this invention by master watchmaker and Ga\u00efa Prize laureate\u00a0\u00c9ric Coudray<\/strong>\u00a0now opens up fresh applications.<\/p>\n

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\u201cTalented designer and master watchmaker \u00c9ric Coudray named his tourbillon \u2018Sph\u00e9rillon\u2019 to simply define its main technical specificity,\u201d noted journalist and watchmaker Vincent Daveau in a Swiss horology journal. He recalled that \u201cin 1801, Abraham-Louis Breguet also christened his cage \u2018tourbillon,\u2019 as it performed a regular rotation to cancel out balance defects of the regulating organ inside\u2014because once the watch was running, the component seemed to whirl.\u201d<\/p>\n

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A Concentration of Feats Inspiring Creativity<\/strong><\/p>\n

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Rarely has a mechanical calibre embodied such a blend of enchantment, kinetics, chronometric complexity, and precision. Now, under the PX designation, the celebrated Sph\u00e9rillon has been reduced in size, making it more accessible for those returning to the design of timepieces with more \u201creasonable\u201d dimensions\u2014aligned with the global trend back to 40 mm diameters, or even smaller.<\/p>\n

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This roadmap also brought an inevitable gain in reliability thanks to fewer components overall. Notably, the thickness remains at 9.46 mm\u2014even in \u201cfull options\u201d versions\u2014and the 50-hour power reserve is still guaranteed.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\u2018A calibre housed in a case that stays true to the current trend of watches returning to around 40 mm in diameter, with a tonneau and square shape.\u2019?<\/strong><\/p>\n

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Photographer and graphic artist\u00a0J\u00e9r\u00f4me Saillard<\/strong>\u00a0has demonstrated through case studies that countless combinations are possible. \u201cThe mainplate has been optimized to optionally integrate additional functions: two options for power reserve display (at 6 o\u2019clock or 4 o\u2019clock), the addition of a seconds hand aligned with the off-centered hour track while preserving clear legibility of the hour and minute hands, and not forgetting the automatic winding system,\u201d explains\u00a0Bastien Maillefer<\/strong>, Purtec\u2019s head of watchmaking.<\/p>\n

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\u00a0<\/strong>Prestigious brands lining up<\/strong><\/p>\n

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Under the PX designation, these evolutions of the Sph\u00e9rillon are hyper-complex micromechanical constructions, already being tested for months on the wrists of Purtec\u2019s watchmakers. There is little doubt that this vast territory of new technical and aesthetic possibilities will soon inspire the most prestigious houses of haute horlogerie to create pieces that go far beyond mere \u201ctalking pieces.\u201d<\/p>\n

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https:\/\/purtec-movements.com<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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PX Purtec calibres 21,600 vph, technology and materials<\/strong><\/p>\n

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With reduced diameter and thickness, the PX calibres fit seamlessly into tonneau cases (32.8 mm from 3\u20139h and 34.3 mm from 12\u20136h), as well as square or round designs. The rotation speed of the titanium outer cage of the tourbillon remains at 30 seconds, ensuring extraordinary visual appeal. To achieve greater inertia despite the smaller size, the balance arms and weights are crafted in solid gold. Meanwhile, the outer terminal curves of the Breguet spirals at the heart of these calibres\u2014beating at 3 Hertz, or 21,600 vibrations per hour\u2014are shaped internally in the \u201cPhilips\u201d style.<\/p>\n

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Jo\u00ebl A. Grandjean \/ 1876 News<\/em><\/p>\n

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Sienna Private Equity joins TEC Group<\/strong><\/p>\n

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On October 17, 2025,\u00a0TEC Group<\/strong>, founded in 2008 by Arnaud Faivre, announced the entry of\u00a0Sienna Private Equity (SPE)<\/strong>, a European mid-market private equity fund, as an investor. The transaction coincides with the acquisition of\u00a0AMC Technologies<\/strong>, a leader in precision tool manufacturing. The combined group will be led by Arnaud Faivre and St\u00e9phane Vagne.<\/p>\n

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TEC Group<\/strong>\u00a0is a recognized supplier to Switzerland\u2019s luxury watch industry, specializing in the production of essential components for mechanical movements and partnering with some of the most prestigious watchmaking houses. With SPE\u2019s backing, TEC Group aims to accelerate its growth trajectory\u2014both organically and through strategic acquisitions\u2014while expanding the range of services offered to its clients.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

More compact, PX calibres transcend the Sph\u00e9rillon The horological UFOs known as Sph\u00e9rillon\u2014a contraction of \u201csphere\u201d and \u201ctourbillon\u201d\u2014are undergoing a revolution: now more compact, promising additional functions, and even capable of evolving into automatic calibres. The most avant-garde watch brands are set to experience new, improbable thrills. Under the name PX, the art of the […]<\/p>\n","protected":false},"author":25,"featured_media":13616,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"none","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"footnotes":""},"categories":[28],"tags":[],"edition":[],"class_list":["post-13445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-en"],"_links":{"self":[{"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/posts\/13445","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/users\/25"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/comments?post=13445"}],"version-history":[{"count":0,"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/posts\/13445\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/media\/13616"}],"wp:attachment":[{"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/media?parent=13445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/categories?post=13445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/tags?post=13445"},{"taxonomy":"edition","embeddable":true,"href":"https:\/\/www.ephj.ch\/en\/wp-json\/wp\/v2\/edition?post=13445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}