{"product_id":"seiko-sbgr317-automatic-mechanical-watch-with-stainless-steel-case-sapphire-crystal-72-hour-power-reserve","title":"SEIKO SBGR317 Automatic Mechanical Watch with Stainless Steel Case Sapphire Crystal 72-Hour Power Reserve","description":"```html\n\u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n\u003ctr\u003e\u003ctd colspan=\"2\" style=\"font-weight:800;padding:8px;background:#d9d9d9;\"\u003eProduct Highlights\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd colspan=\"2\" style=\"padding:8px;\"\u003eA 40mm automatic mechanical model that combines presence and wearability. The long-awaited 40mm case size model has arrived in the Heritage Collection equipped with the Caliber 9S6 series. The radiated black dial further enhances its sharp expression. The strong, three-dimensional indices are firmly placed all the way to the outer edge of the calendar frame, harmonizing with the case's presence and creating a well-proportioned, dignified appearance. The case design follows a standard design typical of Grand Seiko, combining presence and luxury while remaining timeless. The Caliber 9S65 \"Mechanical Automatic 3Days\" lasts approximately 3 days at maximum winding, and by adopting the latest hairspring and MEMS (Micro-Electro-Mechanical Systems) technology for the escapement (anchor, gear), the stability of accuracy during actual use has improved. The see-through case back allows you to enjoy the intricate movements of the mechanical movement. This model, which balances presence and wearability while also offering high visibility, can be cherished as a lifelong watch that marks important moments together.\nGrand Seiko\nManufacture\nGrand Seiko is a true manufacture that handles everything in-house from movement development, design, manufacturing, assembly, adjustment, inspection, to shipping. In an environment where each part can be researched and developed from materials, cutting-edge technology is fused with the highest level of craftsmanship. The \"Grand Seiko Studio Shizukuishi,\" overlooking the majestic Iwate Mountain. The \"Shinshu Time Artisan Workshop,\" surrounded by the mountains and lakes of Shinshu. In these two workshops nurtured by rich nature, three movements are created.\nThe Spirit of Takumi\nThe Takumi of Grand Seiko continue to endlessly pursue the essence of time. This attitude is akin to the way of \"Do\" seen in traditional Japanese martial arts, tea ceremony, and flower arrangement. By honing their skills and deepening their spirituality, this path becomes even more refined, opening up new realms. To embody the ever-changing passage of time in a watch, they strive for high precision, visibility, and the beauty of form. Creating a true ideal watch that shines eternally across generations. The challenge of the Takumi knows no end.\nLight and Shadow\nThe Japanese delicately perceive, savor, and cherish the countless expressions created by light and shadow as time flows. The design is based on sharp, flat surfaces and straight lines without distortion. The mirror finish is meticulously polished with the skill of an outstanding craftsman. The multi-faceted cut indices and thick hands. The symbolic designs create beautiful expressions every time the light changes due to time or place, shining brilliantly while maintaining high visibility.\nSpecifications\nExterior: Stainless Steel, Case Back: Stainless Steel and Sapphire Glass\nGlass Material: Dual Curved Sapphire\nCoating: Anti-reflective coating on the inner surface\nLumibrite: None\nCase Size: Width 40mm × Thickness 13mm\nWrist Size (Maximum): 195mm\nClasp: One-push three-fold type\nDrive Method: Mechanical Automatic (with manual winding)\nPower Reserve: Approximately 72 hours (about 3 days) at maximum winding\nAccuracy: Static accuracy: Average daily deviation +5 seconds to -3 seconds (Mobile accuracy: Average daily deviation +10 seconds to -1 second)\nWater Resistance: Daily life water-resistant (10 ATM)\nMagnetic Resistance: Yes\nWeight: 156.0 g\nOthers:\n- See-through case back\n- Screw-lock crown\n- Calendar (date) function\n- Number of jewels: 35\n- Second hand stop function\n- Case back with lion emblem\n- Screw back (Due to manufacturing reasons, there may be individual differences in the orientation of the case back)\nGrand Seiko continues to pursue the essence of watches as a timepiece to walk through life with and evolves continuously.\n【The Holy Land of Mechanical Watches: Shizukuishi High-End Watch Workshop】\nThe \"Shizukuishi High-End Watch Workshop,\" responsible for Grand Seiko's mechanical watches, is located in Shizukuishi Town, Iwate Prefecture. It is a manufacture that consistently handles everything from the design and manufacturing of parts such as hairsprings and gears, which govern the heart of mechanical watches, to assembly, adjustment, inspection, and shipping. Many skilled craftsmen, including those who have received the \"Modern Master\" and \"Yellow Ribbon Medal,\" as well as those who have achieved excellent results in watch skill competitions, are present, and their outstanding craftsmanship produces the world's highest quality mechanical watches. Grand Seiko's mechanical watches, composed of about 200 parts, have the precision of each part significantly affecting the accuracy of the finished product. The coexistence of high-precision parts manufacturing technology and the craftsmanship that assembles them with adjustments down to 1\/100mm creates an environment that has given birth to numerous legendary timepieces in watch history.\nMechanical watches, which use a mainspring as a power source and indicate time through the movement of hands, have inherited this drive method unchanged since their inception. This drive system utilizes the force of the unwinding mainspring to rotate gears at a constant speed, and the escapement mechanism, composed of the \"balance,\" \"anchor,\" and \"gear,\" adjusts the accuracy. The \"anchor\" controls the rotation of the \"gear\" at a constant rhythm based on the regular vibrations of the \"balance.\" The \"balance\" repeats a regular back-and-forth motion like a pendulum, controlling the speed at which the mainspring unwinds to be constant (i.e., regulating) and allowing it to unwind over a long period. This constant motion is transmitted to the hour, minute, and second hands, displaying the time.\n◆ The Pillar Supporting Accuracy: \"Balance Wheel\"\nThe \"balance wheel,\" which is the part of the balance, regulates and controls the repetitive motion of the anchor, maintaining the vibration at a constant speed. It is one of the crucial parts that significantly affects the accuracy of the watch, with weight adjustments made in units of 0.000001g to stabilize the rotation. Because it is an extremely delicate part, even slight temperature changes can cause contraction or expansion, leading to deformation. Therefore, in the 9S mechanical, the number of support pillars has been increased from the usual 2-3 to 4, providing solid support and minimizing the impact of temperature differences on the shape of the balance wheel and, consequently, on accuracy. They are aware that this significantly increases the labor involved in making parts, but they are committed to preventing deformation.\n◆ High Precision Standards Exceeding Chronometer\nThe first Grand Seiko, born in 1960, had the word \"Chronometer\" engraved on the dial as proof of passing the Swiss chronometer standards. However, you will not find the word \"Chronometer\" on today's Grand Seiko. The reason lies in the \"New GS Standards.\" Established in 1998, this standard has a higher precision criterion than the Swiss chronometer standards. There exists a \"Grand Seiko Special (GSS) standard\" that exceeds the \"New GS Standards\" in the 9S mechanical. This precision standard can only be reached by skilled watchmakers who spend many times more time than usual on mechanical watches, resulting in only a very limited number being produced each year. The special heart, with an average daily deviation of +4 seconds to -2 seconds, is indicated by the word \"SPECIAL\" on the dial.\n◆ 17-Day Certification Test\nThe 9S mechanical must undergo a unique certification test based on strict standards lasting 17 days. Under various conditions set at three temperature levels and six positional differences, it cannot bear the Grand Seiko crown unless the time's advance or delay (daily deviation) falls within the standard values.\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd colspan=\"2\" style=\"font-weight:800;padding:8px;background:#d9d9d9;\"\u003eSpecifications\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #5d5d5d;font-weight:600;padding:6px 10px;width:35%;\"\u003eDrive Method\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eMechanical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #5d5d5d;font-weight:600;padding:6px 10px;width:35%;\"\u003eRadio Automatic Correction Function\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #5d5d5d;font-weight:600;padding:6px 10px;width:35%;\"\u003eDisplay Method\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eAnalog\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #5d5d5d;font-weight:600;padding:6px 10px;width:35%;\"\u003eCase\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eSS bezel, SS body, SS case back + sapphire glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #5d5d5d;font-weight:600;padding:6px 10px;width:35%;\"\u003eGlass\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eDual Curved Sapphire Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #5d5d5d;font-weight:600;padding:6px 10px;width:35%;\"\u003eBand Material\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #5d5d5d;font-weight:600;padding:6px 10px;width:35%;\"\u003eBand (Adjustable)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eScrew type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #5d5d5d;font-weight:600;padding:6px 10px;width:35%;\"\u003eAccuracy\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eStatic accuracy: Average daily deviation +5 seconds to -3 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #5d5d5d;font-weight:600;padding:6px 10px;width:35%;\"\u003eSpecification 1\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eAutomatic winding (with manual winding) Case back with lion emblem See-through back Screw back Screw-lock crown\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #5d5d5d;font-weight:600;padding:6px 10px;width:35%;\"\u003eList Price\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003e¥638,000 JPY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n```","brand":"SEIKO","offers":[{"title":"Default Title","offer_id":47586197078100,"sku":"SBGR317","price":510018.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0284\/7401\/5828\/files\/SBGR317_1.jpg?v=1787850634","url":"https:\/\/www.ippojapanwatch.com\/products\/seiko-sbgr317-automatic-mechanical-watch-with-stainless-steel-case-sapphire-crystal-72-hour-power-reserve","provider":"IPPO JAPAN WATCH ","version":"1.0","type":"link"}