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Pro Trek PRW-51FC-1 and PRW-61FC-1 are deluxe models with sapphire crystal and composite band, PRW-51Y-1 is a standard model with resin band
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Amazon.com: Casio Men's PRW-6600Y-2CR Pro Trek Analog-Digital Display Quartz Black/Blue Watch : Clothing, Shoes & Jewelry
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Amazon.com: Casio PRO Trek PRW-61FC-1JF [ Climber Line (PRW-61 Series eco-Materials Model Equipped with Radio Wave Solar] Imported from Japan Jan 2023 Model Black : Clothing, Shoes & Jewelry
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