{"product_id":"seiko-sbgm221-grand-seiko-mechanical-watch-automatic-movement-stainless-steel-case-sapphire-crystal-39mm","title":"SEIKO SBGM221 Grand Seiko Mechanical Watch - Automatic Movement - Stainless Steel Case - Sapphire Crystal - 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;\"\u003eA sophisticated mechanical automatic winding 3Days GMT watch that elegantly wears a classic style. The GMT model, which has received long-standing support from many customers, is now equipped with the evolved Caliber 9S66 while maintaining the original design. It lasts approximately 3 days at maximum winding, and the adoption of the latest hairspring and MEMS (Micro-Electro-Mechanical Systems) technology for the escapement (anchor, gear) has improved the stability of accuracy during actual use. The box-shaped sapphire glass that revives the classical form, the gently flowing lugs with delicate Zaratsu polishing, the dark brown leather strap, the rich ivory dial, and the blue steel 24-hour hand create an elegant classic style. The see-through case back allows you to enjoy the intricate movements of the mechanical movement. This watch enhances the wearer's individuality while making a statement, and as it is used over time, it deepens affection and highlights the charm of adulthood appropriate for each age.\nGrand Seiko\nManufacture\nGrand Seiko is a true manufacture that handles everything from movement development, design, manufacturing, assembly, adjustment, inspection, to shipping in-house. 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. 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 form is primarily based on sharp, flat surfaces and straight lines without distortion. The mirror surface is meticulously polished with the exceptional skills of artisans. The multi-faceted cut indices and thick hands. The symbolic designs create beautiful expressions every time the light changes due to time or place, ensuring high visibility while shining brilliantly.\nSpecifications\nExterior: Stainless Steel, Case Back: Stainless Steel and Sapphire Glass\nGlass Material: Box-shaped Sapphire\nCoating: Anti-reflective coating on the inner surface\nLumiBrite: None\nCase Size: Width 39.5mm × Thickness 13.7mm\nWrist Size (Maximum): 185mm\nClasp: One-push three-fold type\nDrive Type: 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 resistance\nMagnetic Resistance: Yes\nWeight: 88.0 g\nOthers:\n- See-through case back\n- 24-hour hand (dual time display function)\n- 6-screw fixed case back\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 and evolves.\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 hairsprings and gears, to assembly, adjustment, inspection, and shipping. Many skilled craftsmen, including those who have received the \"Modern Master\" and \"Yellow Ribbon Medal,\" and 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 greatly influencing 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 the birth of this style. 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,\" which controls the rotation of the \"gear\" 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 important parts that greatly influences 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 supports, which is usually 2 to 3, has been increased to 4 to provide solid support and minimize 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, but they are committed to 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,\" which is a precision criterion that can only be reached by skilled watchmakers who spend many times more time than usual on a mechanical watch. The special heart of the watch, 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 directional differences, it cannot bear the Grand Seiko crown unless the advance or delay (daily deviation) remains 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%;\"\u003eBody Weight\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003e88g\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%;\"\u003eDrive Type\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eMechanical (Automatic with manual winding)\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;\"\u003eStainless Steel\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;\"\u003eBox-shaped Sapphire Glass (with anti-reflective coating on the inner surface)\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;\"\u003eCrocodile\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%;\"\u003eFeatures\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #ccc;padding:6px 10px;\"\u003eSee-through case back: with lion emblem, Number of jewels: 35, 24-hour hand (dual time display function), Calendar-linked time difference correction function, Second hand stop function, 6 screws\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¥671,000 JPY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n```","brand":"SEIKO","offers":[{"title":"Default Title","offer_id":47531080351828,"sku":"SBGM221","price":535738.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0284\/7401\/5828\/files\/SBGM221_2.jpg?v=1787245300","url":"https:\/\/www.ippojapanwatch.com\/products\/seiko-sbgm221-grand-seiko-mechanical-watch-automatic-movement-stainless-steel-case-sapphire-crystal-39mm","provider":"IPPO JAPAN WATCH ","version":"1.0","type":"link"}