{"product_id":"longines-ultra-chron","title":"Longines, Ultra-chron","description":"\u003cp\u003eLaunched in 1967 to celebrate Longines' centenary, the Ultra-Chron represented a pinnacle of the \"high-beat wars.\" Its primary milestone was the introduction of the in-house Caliber 431, which oscillated at 36,000 vibrations per hour (vph). This frequency allowed Longines to guarantee accuracy within one minute per month—a bold claim designed to outshine the burgeoning electronic tuning-fork watches of the era.\u003cbr\u003eIn 1968, the line achieved another first with the Ultra-Chron Diver (Ref. 7970), the world's first high-frequency diving watch.\u003c\/p\u003e\n\u003cp\u003eFor collectors, the Ultra-Chron is a \"hidden gem\" offering high-horology engineering at an accessible price point. As for its technical Ingenuity, features like molybdenum disulfide dry lubrication were pioneered to prevent oil from \"flinging\" off the fast-moving escapement.\u2028 The \"Jumbo\" cases and faceted lugs also offer a sharp, architectural 1960s silhouette.\u2028\u003c\/p\u003e\n\u003cp\u003eThe 10-beats-per-second movement creates a signature, ultra-smooth seconds hand glide that modern 4Hz watches cannot replicate - it really is very smooth. Recent \u003ca href=\"https:\/\/www.longines.com\/en-gb\/p\/watch-ultra-chron-l2-537-4-72-2\" title=\"Longines re-editions\" rel=\"noopener\" target=\"_blank\"\u003eLongines re-editions\u003c\/a\u003e in 2022 and 2025 have significantly boosted interest in this groundbreaking watch.\u003c\/p\u003e\n\u003cp style=\"padding-left: 40px;\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eTech Specs.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"padding-left: 40px;\"\u003e\u003cstrong\u003eReference\u003c\/strong\u003e: Longines 7951-1\u003cbr\u003e\u003cstrong\u003eYear:\u003c\/strong\u003e  c.1968\u003cbr\u003e\u003cstrong\u003eMovement\u003c\/strong\u003e:    Automatic, Calibre 431 \u003cbr\u003e\u003cstrong\u003eService History\u003c\/strong\u003e:  Serviced 2023\u003cbr\u003e\u003cstrong\u003eDial: \u003c\/strong\u003e Silver Grey\u003cbr\u003e\u003cstrong\u003eCase\u003c\/strong\u003e:  Stainless steel with screw-in caseback.\u003cbr\u003e\u003cstrong\u003eMeasurements\u003c\/strong\u003e:  38mm (case diameter), 42mm lug-to-lug, 10mm thickness\u003cbr\u003e\u003cstrong\u003eWater Resistant\u003c\/strong\u003e:  No\u003cbr\u003e\u003cstrong\u003eCrystal\u003c\/strong\u003e:  Acrylic\u003cbr\u003e\u003cstrong\u003eCrown: \u003c\/strong\u003e signed Longines\u003cbr\u003e\u003cstrong\u003eStrap\/Bracelet\u003c\/strong\u003e:  no-brand used green leather, Longines buckle.\u003cbr\u003e\u003cstrong\u003eLug Width\u003c\/strong\u003e:  17mm\u003cbr\u003e\u003cstrong\u003eBox \u0026amp; Papers:\u003c\/strong\u003e No\u003cbr\u003e\u003cstrong\u003eWarranty: \u003c\/strong\u003e6 Months\u003c\/p\u003e\n\u003cp style=\"padding-left: 40px;\"\u003eWatches modelled on a 7” (18cms) wrist\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"\"\u003e\u003cspan style=\"color: rgb(2, 227, 223);\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eThe UltraChron is one of Longines' classic vintage watches and this example is in great cosmetic condition. The dial is gorgeous and gets plenty of comments when I've worn it, for two main reasons: one its outstanding dial and two, its quite big for a vintage 1960s watch - coming in at a rather modern 38mm case diameter. The lume is still present on the hands and the crosshairs on the dial are also in great unfaded condition. The date in its trapezoidal date window also turns properly. \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"\"\u003e\u003cspan style=\"color: rgb(2, 227, 223);\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eThe watch does not come with box and papers. The watch is keeping good time and keeping in vintage watch timing parameters (not more than +\/- 30s\/day).  There are a few scratches and small dents on the case back and case commensurate with a watch this age.  I've kept it on the used green leather strap that I got it with and which sets the watch off nicely: please be aware of that.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"\"\u003e \u003c\/p\u003e","brand":"Vintage Chronicle","offers":[{"title":"Default Title","offer_id":53745740480849,"sku":"0007","price":895.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1020\/4148\/5649\/files\/0007LonginesUltrachron2.jpg?v=1778501771","url":"https:\/\/www.vintagechronicle.co.uk\/products\/longines-ultra-chron","provider":"Vintage Chronicle","version":"1.0","type":"link"}