G-SHOCK G-Shock SKY COCKPIT GRAVITYMASTER Gravity Master wristwatch GW-3000M-4AER Casio. SKY COCKPIT" series specializing in shock resistance and centrifugal gravity resistance. Radio reception: WWVB, frequency: 60 kHz Radio reception: MSF / DCF77, frequency: 60 kHz / 77.5 kHz Radio reception: BPC, frequency: 68.5 kHz.
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