GRAND SEIKO - Heritage Collection - SBGR317

Product Specifications

Product Features
Self-winding mechanical model with a case size of 40 mm that combines presence and wearability
The long-awaited 40mm case size model is now available in the Heritage Collection equipped with caliber 9S6 series. The black dial with radiating effect enhances the tightened look of the watch. The strong, three-dimensional indexes are placed well outside the calendar frame, harmonizing with the presence of the case and creating a well-proportioned, imposing face. The case design follows the standard Grand Seiko design with a sense of presence and luxury that will never grow old. The caliber 9S65 “Mechanical Automatic Winding 3 Days” lasts for approximately 3 days at maximum winding, and the latest balance spring and MEMS escapement (ankle, escapement wheel) have improved the stability of accuracy during actual use. Through the see-through back cover, the wearer can enjoy watching the mechanical movement spinning the time with great precision. This model, with its well-balanced combination of presence and wearability, as well as high legibility, will serve you for a long time as a timepiece that will mark precious moments together for a lifetime.

Grand Seiko

Manufacture
Grand Seiko is a true manufacture that handles everything from movement development to design, manufacturing, assembly, adjustment, inspection, and shipping. In an environment where every single component can be researched and developed from the raw materials, cutting-edge technology and the highest level of craftsmanship are fused together. Grand Seiko Studio Shizukuishi overlooking the majestic Mt. Shinshu Toki no Takumi Studio is surrounded by the mountains and lakes of Shinshu. Three movements are created at these two studios, both of which are surrounded by the rich natural environment.

The Spirit of Takumi
Grand Seiko's craftsmen are in endless pursuit of the essence of time. This is similar to the “way” of the ancient Japanese martial arts, tea ceremony, and flower arrangement. By refining one's skills and deepening one's spirituality, the path is further sharpened and opens up new frontiers. In order to embody the ever-changing time in our timepieces, we must master the art of high precision, legibility, and beauty of form. To create a true ideal watch that will shine forever beyond generations. There is no end to the challenge of our craftsmen.

Light and Shadow
Japanese people delicately sense, appreciate, and love the myriad expressions of light and shadow created by the passage of time. Sharp, distortion-free planes and straight lines are the main form. The mirror surface has been elaborately polished by the skill of a master watchmaker. The multi-faceted cut indexes and bold hands. The symbolic designs are created to shine brilliantly while maintaining high legibility, creating a beautiful expression each time when the light changes depending on the time and place.

Specifications
Exterior : Stainless steel Back cover : Stainless steel and sapphire glass

Glass Material :Dual-curved sapphire

Coating :Internal anti-reflective coating

Lumibrite :None

Case Size :40mm (width) x 13mm (thickness)

Wrist circumference (maximum) :195mm

Clasp :One-push three-fold closure

Driving System :Mechanical, self-winding (with manual winding)

Duration : Approx. 72 hours (approx. 3 days) at maximum winding

Accuracy :Static accuracy: Average daily difference +5 seconds to -3 seconds (Portable accuracy: Average daily difference +10 seconds to -1 second)

Water resistance :Reinforced water resistance for daily life (10 atm)

Magnetic resistance :Yes

Weight :156.0 g

Other : Other
See-through back
Screw lock crown
Calendar (date) function
Number of jewels: 35
Seconds hand stop function
Lion's head insignia on the back cover
Screw back (Due to manufacturing reasons, there are individual differences in the orientation of the back cover.)
Grand Seiko continues to evolve in pursuit of the essence of a watch as a wristwatch that will accompany you through life.