{"product_id":"longines-ultra-chron-cal-431-automatic-watch-square-date-silver-dial-as-is","title":"LONGINES ULTRA CHRON CAL 431 AUTOMATIC WATCH SQUARE DATE SILVER DIAL AS IS","description":"\u003ch2\u003eLONGINES ULTRA CHRON CAL 431 AUTOMATIC WATCH SQUARE DATE SILVER DIAL AS IS\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e For parts or not working\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAccessories:\u003c\/strong\u003e None\u003c\/p\u003e\n\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eOffered is a rare vintage Longines Ultra-Chron with a square case, dating from the 1960s to 1970s.\u003c\/p\u003e\n\u003cp\u003eThe Cal. 431 movement used in this watch was one of only two chosen for final selection in the Apollo program. It is a high-beat movement operating at 10 vibrations per second and has proven its reliability through various tests, including those for temperature variations, making it a truly practical timepiece.\u003c\/p\u003e\n\u003cp\u003eThis particular model features a less common square case design within the Ultra-Chron line.\u003c\/p\u003e\n\u003cp\u003eWhile the dial shows signs of age, the case and case back remain in good and clean condition.\u003c\/p\u003e\n\u003cp\u003eThe watch operates with a gentle swing, but precise daily accuracy (rate) has not been measured. We recommend purchasing this item with maintenance in mind.\u003c\/p\u003e\n\u003cp\u003e・Model Name: Ultra Chron\u003c\/p\u003e\n\u003cp\u003e・Brand: Longines\u003c\/p\u003e\n\u003cp\u003e・Era: 1960s-1970s\u003c\/p\u003e\n\u003cp\u003e・Movement: Automatic \/ Cal. 431\u003c\/p\u003e\n\u003cp\u003e・Dial: Original\u003c\/p\u003e\n\u003cp\u003e・Case Material: Stainless Steel\u003c\/p\u003e\n\u003cp\u003e・Case Size: 30mm (excluding crown)\u003c\/p\u003e\n\u003cp\u003e・Lug Width: 19mm\u003c\/p\u003e\n\u003cp\u003e・Strap: Leather with stitching\u003c\/p\u003e\n\u003cp\u003e・Accessories: None\u003c\/p\u003e\n\u003cp\u003e・Condition: Vintage (Pre-owned)\u003c\/p\u003e\n\u003cp\u003ePlease note that only the items shown in the photos are included. No additional items are included beyond what is shown.\u003c\/p\u003e\n\u003ch3\u003eCondition \u0026amp; Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e For parts or not working\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eItem Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Switzerland\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomized:\u003c\/strong\u003e Unknown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Wristwatch\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eShips from Japan.\u003c\/strong\u003e Actual availability is confirmed after your order. Items may also be listed or sourced through other marketplaces. If an item becomes unavailable, your order will be promptly cancelled and refunded.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEmail updates\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWant first dibs on new arrivals and restocks?\u003c\/strong\u003e Send us a message and include the email address you want us to use for store updates.\u003c\/p\u003e\n\u003cp\u003eWe only use it for product updates, restock notes, and store announcements. You can also use the contact page if you want to ask a question at the same time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCTA:\u003c\/strong\u003e \u003ca href=\"\/pages\/email-updates?utm_source=product_page\u0026amp;utm_medium=internal\u0026amp;utm_campaign=email_updates_cta\"\u003eEmail updates\u003c\/a\u003e | \u003ca href=\"\/pages\/contact-legal-notice?utm_source=product_page\u0026amp;utm_medium=internal\u0026amp;utm_campaign=email_updates_cta\"\u003eContact\u003c\/a\u003e | \u003ca href=\"\/pages\/faq?utm_source=product_page\u0026amp;utm_medium=internal\u0026amp;utm_campaign=email_updates_cta\"\u003eFAQ\u003c\/a\u003e\u003c\/p\u003e","brand":"Japan Quality Pre-Owned","offers":[{"title":"Default Title","offer_id":52470568059173,"sku":"SH-_SAT_20260506m58501020870","price":410.94,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1000\/3496\/9893\/files\/1_b70dc803-0bc6-4d8a-bedb-86eeb1b48c7e.jpg?v=1780926663","url":"https:\/\/japan-quality-pre-owned.myshopify.com\/products\/longines-ultra-chron-cal-431-automatic-watch-square-date-silver-dial-as-is","provider":"Japan Quality Pre-Owned","version":"1.0","type":"link"}