{"product_id":"seiko-sbgm247-grand-seiko-sport-collection-mechanical-gmt-automatic-self-winding-watch-stainless-steel-39mm","title":"SEIKO SBGM247 Grand Seiko Sport Collection Mechanical GMT Automatic Self-Winding Watch Stainless Steel 39mm","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;\"\u003eCompact-sized Mechanical GMT Watch\nThis GMT watch is one of the Grand Seiko timepieces that balances practicality and beauty. It features thicker, more legible hour and minute hands and indices to ensure accurate and quick reading of the time in various situations. The design balances the visibility of the second hand and GMT hand, pursuing high visibility. The calm green dial, which creates a variety of expressions like a wilderness, is also a distinctive point that combines practicality and beauty. Additionally, despite its compact case size of 40.5mm, it is equipped with reinforced water resistance of 20 atmospheres, fully meeting the requirements expected of a sports watch.\nGrand Seiko\nManufacture\nGrand Seiko is a true manufacture that handles everything in-house, from movement development to design, manufacturing, assembly, adjustment, inspection, and shipping. In an environment where each component 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, and the \"Shinshu Time Artisan Workshop,\" surrounded by the mountains and lakes of Shinshu, are where three movements are created in two workshops nurtured by rich nature.\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 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 artisans knows no end.\nLight and Shadow\nJapanese people delicately perceive, savor, and cherish the countless expressions created by light and shadow as time flows. The design is characterized by sharp, flat surfaces and straight lines without distortion. The mirror finish, meticulously polished by exceptional craftsmanship. 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: Yes (hands and indices)\nCase Size: Width 40.5mm, Length 48.6mm, Thickness 14.4mm\nWrist Size (Maximum): 192mm\nClasp: One-push three-fold type\nDrive Type: Mechanical Automatic (with manual winding)\nPower Reserve: Approximately 72 hours (about 3 days) when fully wound\nAccuracy: Static accuracy: Average daily deviation +5 seconds to -3 seconds\nWater Resistance: Daily life reinforced water resistance (20 atmospheres)\nMagnetic Resistance: Yes\nWeight: 180.0 g\nOthers:\n- Screw back\n- 24-hour hand (dual time display function)\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- Calendar-linked time difference correction function\nGrand Seiko continues to pursue the essence of watches as a timepiece to walk through life with.\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 components such as the hairspring 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 exceptional 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 artisan skill of assembling while adjusting to 1\/100mm units 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 the time through the movement of hands, have inherited this drive system unchanged since their inception. This drive system utilizes the force of the unwinding mainspring to rotate gears at a constant speed, and the accuracy is adjusted by a regulating and escapement mechanism composed of the \"balance,\" \"anchor,\" and \"escape wheel.\" The \"anchor,\" which controls the rotation of the \"escape wheel\" at a constant rhythm, operates based on the regular vibrations of the \"balance.\" The \"balance\" repeats a pendulum-like regular back-and-forth motion, 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 wheel part of the balance, adjusts 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. Being a very delicate part, slight temperature changes can cause contraction or expansion, leading to deformation. Therefore, in the 9S mechanical, the number of support pillars is 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 of making parts and are devising ways to prevent 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 standard. However, you will not find the word \"Chronometer\" on today's Grand Seiko. The reason lies in the \"New GS Standard.\" Established in 1998, this standard has a higher precision criterion than the Swiss chronometer standard. There exists a \"Grand Seiko Special (GSS) Standard\" that exceeds the \"New GS Standard\" in the 9S mechanical. This precision standard can only be reached by skilled watchmakers who spend many times more time than usual on a mechanical watch, allowing for only a very limited number to be 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 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 Type\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;\"\u003eBezel SS, Case SS, Case Back SS\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;\"\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;\"\u003eNumber of jewels: 35, 24-hour hand (dual time display function), calendar-linked time difference correction function, second hand stop function, calendar (date) function included\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%;\"\u003eSpecification 3\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eCase Size: Length 48.6mm × Width 40.5mm × Thickness 14.42mm\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¥792,000 JPY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n```","brand":"SEIKO","offers":[{"title":"Default Title","offer_id":47586196783188,"sku":"SBGM247","price":759752.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0284\/7401\/5828\/files\/SBGM247_2.jpg?v=1787850615","url":"https:\/\/www.ippojapanwatch.com\/products\/seiko-sbgm247-grand-seiko-sport-collection-mechanical-gmt-automatic-self-winding-watch-stainless-steel-39mm","provider":"IPPO JAPAN WATCH ","version":"1.0","type":"link"}