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
Casio ALT 6000 - AltiThermo Sensor - YouTube
Casio ALT-6000, ALT-6100 Watch Strap (20mm fitting, 25mm at shoulders)