{"product_id":"grand-seiko-heritage-spring-drive-sbga203-sbga203","title":"Grand Seiko Heritage Spring Drive SBGA203","description":"Designed with a stainless steel case and bracelet, this 41.0mm Grand Seiko Caliber 9R65, features the signature clear Grand Seiko ridges on the facets of the case and the diamond-cut hands and markers on a black dial.  Spring Drive, a unique Seiko movement that requires neither a battery nor an electric motor, makes it a completely self-contained system. Its power is derived from a mainspring, just like a mechanical watch, and its accuracy is controlled by the precise signal of a quartz oscillator.  These watches are all accurate to ±10 seconds per month, a level that is higher than any other existing spring-wound watch in the world.  Featuring a see-through caseback, Spring Drive movement allows for self and automatic winding capabilities and features 30 jewels, with accuracy +\/- 1 second per day with over 72 hours power reserve.  100M Water Resistant\n","brand":"Grand Seiko","offers":[{"title":"Default Title","offer_id":34981378916506,"sku":"WGGSK02614","price":4900.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0416\/5874\/4986\/products\/grand-seiko-heritage-spring-drive-sbga203-sbga203-240977.jpg?v=1620872494","url":"https:\/\/chpremier.com\/products\/grand-seiko-heritage-spring-drive-sbga203-sbga203","provider":"CH Premier Jewelers","version":"1.0","type":"link"}