[Rare Vintage] 1990s Casio Twin Sensor ALT-6100 (Excellent Condition)

If you’re a vintage Casio collector, you already know what this is: a truly rare piece that only shows up once or twice a year—and finding one in this kind of condition is even harder. I’m letting go of part of my collection with a heavy heart.

This is the Casio Twin Sensor ALT-6100 (Module 983), a masterpiece from Casio’s early-to-mid 1990s outdoor vintage lineup.

It’s an extremely hard-to-find old Casio rare item both in Korea and internationally. It also pairs perfectly as a standout accessory for today’s gorpcore looks or Y2K street fashion, with a unique, unmistakable vintage vibe.

Condition & Features

• Overall condition: Very well preserved for its age. The bezel markings are clear and not worn off, and the watch looks excellent overall.
• Display condition: No screen bleed or fading; the display is bright, crisp, and clear.
• Function check: Time and day display work properly. The key features of this model—Altimeter/Barometer (ALTI) and Thermometer (THERMO)—all function perfectly with no ERR messages. Button beep and backlight are also working normally.

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