Casio SG-100 Solar Watch Japan 1985 ULTRA RARE COLLECTORS PIECE

One of the rarest watches in the western world!

All original strap in great condition.

ULTRA RARE Casio SG-100 Watch Solar from the 1980s 

New solar cell recently fitted 100% works as it should in light and without 

Service and guarantee

A true Casio collectors watch

The Casio SG-100 powered by the Module 624 is an exceptionally rare, vintage solar-powered digital watch released in approximately 1985

• The Engine (Module 624): A classic first-generation solar module designed with a built-in battery charging indicator. 
• Solar Architecture: The most striking aspect of the watch is a horizontally segmented photoelectric solar panel that takes up the majority of the rectangular face. The solar panel lines are intentionally integrated into the watch face and matching strap for a distinct 80s/90s technical aesthetic. 
• Ultra-Thin Profile: Despite housing a solar panel larger than its LCD screen, the case design is remarkably thin—comparable to Casio's concept "Pela Film" watches of that era. 
• Premium Build: Built with a stainless steel case back and often paired with a premium metal bracelet or matching resin/silicon strap, giving it a much heavier, higher-end feel than standard plastic Casios. 
• Simple Display Mode: The screen displays time (5 ½ digits with smaller seconds), the date (stacked above the seconds), and a dedicated day-of-the-week marker running along the top of the LCD.