Grand Seiko Spring Drive Platinum SBGA065 Limited Edition 50th Anniversary

More about Spring Drive Platinum SBGA065 Limited Edition 50th Anniversary

This is a .950 platinum Grand Seiko Spring Drive 50th Anniversary SBGA065. It has an alligator leather strap with a signed platinum tang buckle, and scratch resistant sapphire crystals with anti-reflective coating, including a dual-domed face crystal. It includes a pull-out signed winding crown and an exhibition sapphire display case back secured with six screws and engraved with "50TH ANNIVERSARY 1960-2010 - .950 PLATINUM – 10 BAR," hallmarks and a serial number. The 40.2mm diameter round two-body solid case, gently curved lugs, and angled bezel, are polished. It has anti-magnetic resistance to 4800 A/m (60 gauss), and it includes a silver grained "blizzard" dial with applied faceted white gold baton hour markers surrounded by a black perimeter minute/second scale, white gold dauphine sword hour and minute hands, and a yellow gold center sweep second hand with a wedge counterbalance. It has a gold-framed date aperture window at the 3 o'clock position with the yellow gold applied Grand Seiko lion emblem and gold script with "50TH ANNIVERSARY." There's a fan-shaped recessed power reserve indicator with a comet-shaped scale with a white gold indicator hand between 7 and 8 o'clock. It has a 72-hour power reserve at full winding, it's water-resistant to 30 meters/100 feet, and the 12.8mm thick case, dial, and movement are all signed. This Grand Seiko Spring Drive 50th Anniversary SBGA065 has a mechanical automatic self-winding Grand Seiko caliber 9R15 Spring Drive movement. It's rhodium plated with Cotes de Geneve embellishment constructed with 30 jewels, an anti-shock system, a rotor with an 18K yellow gold Grand Seiko medallion, and instead of an escapement and balance wheel, Spring Drive’s Tri-Synchro Regulator performs as a brake controlling the release of energy from the mainspring at the correct rate to ensure the ultimate accuracy. The Seiko "Magic lever" mechanism allows the mainspring to drive a series of gears that in turn drive the rotor that generates a small electrical charge activating the electronic circuit and the oscillator, hence the incredible accuracy. The mechanism oscillates at a high frequency of 36,000 vph (5Hz). The Grand Seiko Spring Drive 50th Anniversary SBGA065 was introduced in 2010 in an extremely limited edition of 30 examples to commemorate Grand Seiko's 50th year.

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