Casio is adding three new analog watches to its outdoor-focused Pro Trek brand. The PRJ-01 series, launching in the Japanese market this July, steps away from the bulky, sensor-heavy digital designs usually associated with the lineup. Instead, these new models offer a straightforward three-hand analog layout housed in a much smaller footprint.

Design Details
The two higher-tier models, the PRJ-01AE-8JR and PRJ-01AE-7JR, ship with a carabiner attachment that can replace the standard urethane band. The swap doesn’t require specialized tools, allowing users to detach the watch case from their wrist and clip it directly to a backpack strap, belt loop, or outdoor gear.
In terms of size, the PRJ-01 is relatively small for an outdoor watch. The case measures 39.1mm wide and 11.6mm thick, bringing the total weight to just 32 grams. Casio is using bio-based resin for the case, case back, and the standard strap.
The strap itself uses a tuck-under design, which routes the tail end of the band against the wrist rather than leaving it exposed. This is a practical design choice intended to keep the watch from catching on jacket sleeves or equipment.

Casio has also changed how the crown operates. Rather than a standard screw-down mechanism, the PRJ-01 uses a rotating guard bezel. In its default position, the bezel covers the crown entirely to prevent accidental time adjustments or snagging. Turning the bezel 45 degrees exposes the crown at the bottom right of the case, allowing access to the time and date settings.
The dial is fully phosphorescent, meaning the entire white background glows in low-light environments to provide contrast against the hands and markers. The dial is also light-transmissive, which allows the built-in solar charging system to draw power from sunlight and indoor lighting.
Casio claims the watch can operate for approximately five months on a full charge, even without further exposure to light. It also features 100 meters of water resistance and a mineral glass crystal.

Pricing and Availability
The carabiner-equipped PRJ-01AE-8JR (grey) and PRJ-01AE-7JR (white) are priced at ¥31,350 ($192), while the base PRJ-01-1JF (black) model is priced at ¥25,300 ($156). All three models are currently available for pre-order in Japan.
In related news, Casio has recently launched five new Edifice EFK-200 automatic watches and three W738H digital watches with vibration alerts in the US.
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