【Features/Selling Points】 This is a 1960s-70s Longines Ultra-Chron square case watch. The Cal. 431 movement used in this watch was one of the two movements that remained in the final selection for the official watch used in the Apollo program. It is a machine that cleared tests such as temperature differences while having a specification of 10 vibrations per second, making it truly suitable for a practical watch. This is a square case model, which is rare among Ultra-Chron watches. Although there is deterioration on the dial, the case and back cover are in good condition and remain beautiful. It works when lightly shaken, but the detailed daily rate has not been confirmed. Please purchase with the assumption that maintenance will be required. A different color version is sold out at Sweet Road for 98,000 yen. 【Model Name】 Ultra Chron 【Brand Name】 Longines 【Production Year】 1960s-70s 【Movement】 Automatic / Cal. 431 【Dial】 Original 【Case Material】 Stainless Steel 【Case Size】 30mm (excluding the crown) 【Lug Width】 19mm 【Belt】 Leather stitch belt 【Accessories】 None 【Condition】 Antique (Used)