{"product_id":"seiko-sbga439-grand-seiko-heritage-collection-spring-drive-automatic-9r-spring-drive-standard-design-limited-edition","title":"SEIKO SBGA439 Grand Seiko Heritage Collection Spring Drive Automatic 9R Spring Drive Standard Design Limited Edition","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;\"\u003eClassic design in Midnight Blue\nThe dial color features a near-black Midnight Blue, and it is a Spring Drive model that adopts the classic Grand Seiko case design. The movement is Seiko's unique Spring Drive. The second hand moves silently and glides across the dial, a characteristic of the Spring Drive, creating a natural flow that harmonizes with the passage of time, made possible by IC control. The maximum power reserve duration is approximately 72 hours (about 3 days), and the remaining duration can be checked on the power reserve display at the lower left of the dial.\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 component can be researched and developed from the material, it fuses cutting-edge technology 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 attitude of Grand Seiko's artisans who endlessly pursue the essence of time. This 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 sharper and opens up new realms. To embody the ever-changing time within 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 artisans 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 characterized by sharp, distortion-free flat surfaces and straight lines. The mirror finish is meticulously polished by exceptional artisans. The multi-faceted cut indices and thick hands. The symbolic designs are created to produce beautiful expressions even as light changes with time and place, shining brilliantly while maintaining high visibility.\nSpecifications\nExterior: Stainless Steel\nGlass Material: Dual Curve Sapphire\nCoating: Anti-reflective coating on the inner surface\nLumiBrite:\nCase Size: Width 40mm × Thickness 12.3mm\nWrist Size (Maximum): 203mm\nClasp: One-push three-fold type\nDrive System: Spring Drive\nPower Reserve: Approximately 72 hours (about 3 days) at maximum winding\nAccuracy: Average monthly deviation ±15 seconds (equivalent to daily deviation ±1 second)\nWater Resistance: Enhanced water resistance for daily life (10 ATM)\nMagnetic Resistance: Yes\nWeight: 157.0 g\nOthers:\n- Screw-lock crown\n- Calendar (date) function\n- Number of jewels: 30\n- Second hand stop function\n- Power reserve display 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.\n■ 9R Spring Drive\nThe Spring Drive is a unique Seiko drive mechanism that uses a mainspring as the power source, while controlling accuracy through the precise signals from a quartz oscillator, which is the control system of quartz watches. The Spring Drive, equipped with a hybrid engine that incorporates the best features of both mechanical and quartz watches, can be described as \"a mechanical watch that achieves high precision\" and also \"a quartz watch that does not use batteries or motors.\"\n◆ Hybrid Mechanism of Mechanical and Quartz\nThe major elements in the mechanism that makes the watch move are \"power\" and \"control system.\"\n- \"Power\" is the force that moves the watch.\n- \"Control system\" is the mechanism that controls the movement of the watch.\nThe Spring Drive is a hybrid movement that adopts \"power: high torque\" from mechanical watches and \"control system: high precision through IC control\" from quartz watches.\n\"Power\" is the \"mainspring\" used in mechanical watches.\nThe power of the Spring Drive comes from the \"mainspring\" used in mechanical watches, a self-contained drive system that does not rely on batteries or motors. When the crown is wound, the mainspring is wound up, and the force trying to unwind the mainspring is transmitted to the gears, moving the hands attached to the gears. The reason the Spring Drive can turn the thick and heavy hands characteristic of Grand Seiko is that it utilizes a high-torque mainspring (rather than a motor).\nThe \"control system\" is the \"Tri-Synchro Regulator.\"\nThe control system of the Spring Drive is a unique speed control mechanism that uses the electrical signals from the IC and quartz oscillator used in quartz watches. \nImagine a toy powered by a mainspring. If the unwinding speed is not adjusted, the mainspring will unwind all at once, and the toy will stop. Therefore, a mechanism is needed to maintain a constant unwinding speed. The \"Tri-Synchro Regulator,\" developed for the Spring Drive, fulfills this role.\nThe TRI in Tri-Synchro Regulator (TRI【3】-SYNCHRO【synchronize】 REGULATOR【speed control device】) refers to:\n1. Mechanical force\n2. Electrical signal\n3. Magnetic force\nThese three interact to create the precise movement of the second hand.\n1. Mechanical force (power: mainspring)\nGenerating electricity from the unwinding force of the mainspring.\nFor example, a bicycle light uses the force of the spinning tire to emit light. The Spring Drive generates power using the same principle, with the rotor and coil wound in the \"stator\" serving as the generator. The rotor spins 8 times per second, generating a small amount of electrical energy.\n2. Electrical signal (precise signal: IC and quartz oscillator)\nThe quartz oscillator emits a precise signal.\nUsing a small amount of electricity, it drives the quartz oscillator and IC. When power is transmitted to the quartz oscillator, it sends a precise signal of 32,768Hz per second to the IC, equivalent to quartz.\n3. Magnetic force (brake: rotor and stator)\nApplying a brake to the rotor to control speed.\nThe IC compares the precise signal from the quartz oscillator with the rotor's rotation speed, intermittently applying magnetic brakes to prevent the rotor from spinning too fast, maintaining a constant speed. By keeping the rotor's rotation constant, controlled movements are transmitted in the order of rotor, gears, and hands, accurately marking the time.\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 System\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 Type\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\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 Curve 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;\"\u003eAverage monthly deviation ±15 seconds (equivalent to daily deviation ±1 second)\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;\"\u003eNumber of jewels: 30, power reserve display function, second hand stop function, calendar (date) function\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 2\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eCase back with lion emblem, 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¥682,000 JPY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n```","brand":"SEIKO","offers":[{"title":"Default Title","offer_id":47586196521044,"sku":"SBGA439","price":654230.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0284\/7401\/5828\/files\/SBGA439_2.jpg?v=1787850596","url":"https:\/\/www.ippojapanwatch.com\/products\/seiko-sbga439-grand-seiko-heritage-collection-spring-drive-automatic-9r-spring-drive-standard-design-limited-edition","provider":"IPPO JAPAN WATCH ","version":"1.0","type":"link"}