GRAND SEIKO - Heritage Collection - SBGA437

Product Specifications

Product Features
Grand Seiko's “Thick Silver Radiation” dial with beautiful luminescence
Shinshu, where Grand Seiko's workshop is located, was once a major silk production area. The “Thick Silver Radiation” dial is a tribute to this production area. The fine radial pattern on the glossy dial, as if lines had been drawn in silk, is an expression of respect for its roots. This delicate pattern can only be drawn with soft silver, so a special technique is applied to the silver plating to achieve it. The movement in this watch is Grand Seiko's original Spring Drive. The second hand glides across the dial without making a sound, which is one of the unique features of the Spring Drive movement. The maximum winding time is about 72 hours (about 3 days), and the remaining time can be checked on the power reserve display on the lower left side of the dial.

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, we combine cutting-edge technology with the highest level of craftsmanship. Three movements are produced in two workshops nurtured in the rich natural environment.

The Spirit of Takumi
Grand Seiko's craftsmen and women continue to endlessly pursue 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

Glass Material :Dual-curved sapphire

Coating : Internal anti-reflective coating

Case Size :Width 40mm, Height 46.6mm, Thickness 12.3mm

Wrist circumference (maximum) :203mm

Clasp :One-push three-fold closure

Driving System :Spring Drive

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

Accuracy :±15 seconds per month (equivalent to ±1 second per day)

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

Magnetic resistance :Yes

Weight :157.0 g

Other : Other
Screw back
Screw lock crown
Calendar (date) function
Number of jewels: 30
Seconds hand stop function
Power reserve indicator
Lion emblem on back cover