Brand : Grand Seiko
Reference : 43999 (early of 57GS)
Case Material : ST. Steel
Case Size : 36mm
Lug Width : 19mm
Movement : 430 (Chronometer)
Frequency : 18000 bph
Jewels : 35
Power Reserve : 42 hrs
Note : 1st Grand Seiko with 1). self-dater 2).Chronometer logo 3). water resistance 4).screw-in type back cover features.
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