⌚ CASIO BM-100WJ — A WEATHER INSTRUMENT ON YOUR WRIST

The BM-100WJ has the look of a miniature instrument panel: a large digital display, printed measurement scales, colour-coded function labels, and that distinctive grille beneath the screen. These details give it a character that vintage Casio collectors will immediately recognise.

Introduced in 1989, the model used a pressure sensor to track atmospheric changes over an 18-hour period. Its graph helped the wearer interpret weather trends, while pressure readings also supported altitude and water-depth calculations.

It belongs to an important chapter in Casio’s sensor-watch history—the outdoor instrument designs that helped pave the way for later PRO TREK models.

For collectors hunting these older resin watches, finding the model is only part of the story. The condition of the surviving case, buttons, and strap attachments matters too. This example retains its distinctive appearance, with visible wear and a replacement strap as detailed below.

🔎 ITEM DETAILS

• Brand: Casio
• Model: BM-100WJ
• Module: 560, confirmed by the caseback
• Model introduction: 1989
• Model functions: Barometer, altimeter, and depth meter
• Atmospheric-pressure trend graph
• Dark resin case with stainless steel caseback
• Non-original replacement strap

📋 CONDITION & TESTING — PLEASE READ

• Sound: Operates normally during testing.
• Light: Operates normally during testing.
• Strap: Replaced; not original to this watch.
• Cosmetic condition: Scratches, scuffs, and signs of use are visible on the crystal, case, and caseback. All photos show the actual watch offered for sale.

📊 IMPORTANT — MEASUREMENT ACCURACY

The barometer, altimeter, and depth-meter functions are part of this model’s original design. Their measurement accuracy on this particular watch has not been verified and is not guaranteed.

A displayed reading should not be taken as proof of an accurately calibrated sensor. Please purchase this watch for its vintage and collecting appeal, rather than as a dependable measuring instrument.

💧 WATER RESISTANCE

The original 10 BAR marking describes the watch’s specification when new. Current water resistance has not been tested and is not guaranteed.

Please keep this vintage example away from water. Its depth-meter feature is not an assurance that it is currently suitable for swimming or diving.

🕰️ CARING FOR VINTAGE RESIN

Older resin components require gentle handling. Avoid forcing the buttons, bending the strap attachments, or overtightening screws. The remaining strength and lifespan of aged components cannot be guaranteed.

Sold as-is with the condition and testing limitations disclosed above. Please review all photos carefully before purchasing.

📦 PACKING & SHIPPING

• Shipped WITHOUT a battery. The battery will be removed before shipment.
• Carefully packed with protective wrapping in a box.
• Shipped from Thailand with tracking.
• Handling time: 1–3 business days.
• Delivery times may vary due to customs processing.
• Any applicable import duties and taxes are the buyer’s responsibility.

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