Casio has released the new "EFS-S660" model from its "EDIFICE" brand, which is based on the concept of "Speed and Intelligence." This analog chronograph watch combines practical functions, including solar power generation, with a case size of 38.3mm in diameter, making it easy to incorporate into everyday styles. Two models with different case colors are available.
A compact case packed with chronograph and solar power functions.
Among Casio's brands, "Edifice" is characterized by its dynamic designs inspired by motorsport. As a new addition to this line, the "EFS-S660" has been released, featuring a solid octagonal case.

Solar-powered quartz watch. Approximately 5 months of operation on a full charge. Stainless steel case (38.3mm diameter, 11.6mm thickness). 10 ATM water resistance. ¥33,000 each (tax included).
The watch comes in two variations: Ref. EFS-S660D-1AJF, featuring a stainless steel case and bracelet, and Ref. EFS-S660PB-1AJF, combining a gray IP-coated stainless steel case with a resin band. Both models share a black dial with a honeycomb-like texture that maintains high light transmittance, enabling stable operation via solar power. Each model also features either a red or blue chronograph seconds hand, giving it a sporty and powerful look.
Furthermore, a notable feature of this model is its compact case design, measuring 38.3mm in diameter and 11.6mm in thickness. In terms of functionality, in addition to the aforementioned solar power generation, it features a chronograph mechanism with sub-dials at the 12, 9, and 6 o'clock positions, and 10 ATM water resistance. The crystal is made of sapphire crystal with an anti-reflective coating on the inside, ensuring high visibility.



