Grand Seiko STGK031

Features

This elegant 30mm wristwatch is a modern interpretation of the celebrated 62GS, Grand Seiko’s first mechanical model to feature automatic winding. It is characterized by its distinctive bezel-free construction, which allows for a seamless integration of the crystal with the case. Like its predecessor, this modern reinterpretation features the characteristic sharp edges and perfectly distortion-free surfaces that only Zaratsu polishing can create, along with a wide dial opening achieved through the bezel-free design.
The pink dial is inspired by sakura-kakushi, a phenomenon in which cherry blossoms are gently hidden beneath a blanket of snow. This tranquil scene unfolds in early spring in northern Japan, where the Grand Seiko Studio Shizukuishi, home to all Grand Seiko mechanical creations, is located.

Specifications

Exterior

Exterior: Stainless steel

Case back: See-through & Screw case back

Glass Material: Box shaped sapphire crystal

Glass Coating: Anti-reflective coating on inner surface

Case size:

Diameter 30.0 mm

Lug-to-lug 36.2 mm

Thickness 10.5 mm

Band width: 15 mm

Clasp type: Three-fold clasp with push button release

Movement

Caliber no.: 9S27 Instructions

‍Movement Type: Automatic with manual winding

Power reserve: Approx. 50 hours

Mean daily rate: +8 to -3 seconds per day

• Mean daily rate is a mean value of daily rates in a condition where the movement before assembly in a case is measured in six positions in a fixed manner under artificially controlled environment for 12 days.

Normal usage accuracy: +10 to -5 seconds per day

Functions

Water resistance: 10 bar

Magnetic resistance: 4,800 A/m

Other details / Features:

• 35 jewels