Casio GMW-15 Moon Graph A Special Watch from Japan 1985

This watch is hard to find

perfect working condition

overall in great condition

new battery and fully serviced and guaranteed.

The Casio GMW-15 "Moon Graph" is a rare, highly collectible vintage digital watch originally released by Casio in 1985.

Known for its retro-futuristic "space-age" layout, it is famous among collectors for its unique animated sub-display and astronomical calculating capabilities

• Module Number: Powered by the Casio 832 quartz module.
• Display: Split into two distinct sections. The upper half features a unique negative-polarized display dedicated strictly to animations and graphics.
• Build: Features a round, lightweight resin case (roughly 38mm), a domed acrylic crystal screen, and a resin or rubber strap.
• Water Resistance: Rated at 50 metres (5 ATM).
• Hardware Limitations: The watch relies entirely on ambient light and does not feature a backlight or a countdown timer.

• Moon Phase Tracking: A prominent, graphic-heavy layout displays the exact current phase and lighted area of the moon as it orbits Earth.
• Moon Hour Angles: Calculates four daily moon hour angles to pinpoint exactly where the moon is positioned across the night sky.
• Sunrise & Sunset Mode: Displays highly accurate local sunrise and sunset times based on geographic coordinates.
• Temporal Constraint: The internal tracking calendar is mathematically accurate up until the year 2029

• Timekeeping: Displays day, date, and time alongside the active moon phase graph.
• Stopwatch & Alarm: Includes a 1/100th-of-a-second chronograph and a daily alarm with an hourly chime.
• Hidden Animation: When the hourly chime triggers, a small shooting star / meteor animation flashes across the negative screen display.