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From the Bulova Accutron Watches, Accutron Gemini Collection. Tuning fork applique adorning sub-skeleton window at 12 H. Automatic, self-winding mechanical movement. Oscillators with skeleton tuning fork design. Sapphire crystals. Luminous hands and markers. Exhibition casebacks. Locking double push-button deployment buckles. Water resistant to 100 meters. Approximate case diameter/width 40mm.