User manual Casio Twin Sensor SGW100B-3V (English - 5 pages)
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User manual Casio SGW100-2B (English - 5 pages)
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Shaun Cuff på Twitter: "This weekend's #VintageWatch is a #Casio ALT-6000 Alti-Thermo. Launched in 1992 this was Casio's first twin sensor watch. Along with the ATC-1000, they were forerunners to Casio's #Protrek