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Casio History Watches 1984
The Digital Watch: A Brief History | PCMag
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Amazon.com: Casio Men's G-Shock Quartz Watch with Resin Strap, Black, 20 (Model: DW5600E-1V) : Clothing, Shoes & Jewelry
The original smartwatches: Casio's history of wild wrist designs - The Verge
