Casio Edifice EFS-S660 officially launches with solar power, sapphire glass, and Toyota Racing styling
Casio has officially introduced the new Edifice EFS-S660 series in Japan, giving fans of sporty chronograph watches two fresh solar-powered models to look forward to. The lineup includes the Casio Edifice EFS-S660D-1AJF with a stainless steel bracelet and the Casio Edifice EFS-S660PB-1AJF with a resin strap and Toyota Racing-inspired design cues.
Both models are scheduled to ship in August 2026 and are priced at ¥33,000, which is approximately $208. With a compact case size, sapphire crystal, 10-bar water resistance, and solar charging, the EFS-S660 series is shaping up to be a strong option for buyers who want a racing-style chronograph without stepping into luxury watch pricing.
The design closely follows the earlier preview images that surfaced before the official listing. The standout detail is the honeycomb-textured dial, which gives the watch a technical, motorsport-inspired look while also allowing light to reach the solar cell underneath. This helps the watch maintain a cleaner, more traditional chronograph appearance instead of looking obviously solar-powered.
The Casio Edifice EFS-S660D-1AJF is the more classic of the two. It comes with a stainless steel case and matching bracelet, giving it a heavier and more premium wrist presence. Blue chronograph hands add a subtle splash of color against the dial, while the total weight comes in at 129 grams. This version is likely to appeal to buyers who prefer a versatile everyday watch that can work with casual outfits, office wear, or weekend use.
The Casio Edifice EFS-S660PB-1AJF takes a sportier route. It features a rubber strap, a gray ion-plated case, and a black ion-plated bezel. Red chronograph hands give it a sharper racing feel, and the lighter 71-gram weight should make it more comfortable for long wear. This model also carries the more distinctive identity of the pair, as Casio is presenting it with Toyota Racing branding and visual ties to Toyota’s GR race cars.
That Toyota Racing connection gives the EFS-S660PB-1AJF a stronger collector angle. Rather than simply being another sporty chronograph, it fits into Casio’s ongoing motorsport-themed Edifice strategy. The red accents, black bezel, lightweight build, and race-inspired presentation all help reinforce that performance-focused image.
Both watches share the same core specifications. The case measures 45.3 x 38.3 x 11.6 mm, making it relatively compact compared with many modern chronographs. The 38.3 mm width is especially notable, as it should make the watch wearable for a wider range of wrist sizes.
Casio has also equipped both models with sapphire crystal featuring an internal anti-reflective coating. That is a welcome feature at this price point, as sapphire offers better scratch resistance than mineral glass and helps keep the watch looking clean over time. The 10-bar water resistance rating also makes the EFS-S660 suitable for daily wear, hand washing, rain, and light water exposure.
Functionally, the Edifice EFS-S660 includes a 1/20-second stopwatch that can measure up to 60 minutes and supports split timing. The chronograph hands are positioned at 12 o’clock for quick readability, while the tachymeter scale is placed on the dial’s outer ring rather than on the bezel. This gives the case a cleaner appearance while keeping the motorsport timing aesthetic intact.
The solar movement is rated to run for about five months on a full charge without additional light exposure. Accuracy is listed at approximately ±20 seconds per month, which is typical for a solar quartz chronograph in this category. For most users, that means low-maintenance timekeeping with no regular battery changes required.
With the Edifice EFS-S660D-1AJF and EFS-S660PB-1AJF, Casio is offering two very different flavors of the same compact solar chronograph. One leans toward refined stainless steel versatility, while the other embraces a lighter, bolder Toyota Racing character. Both bring useful everyday specs, a sapphire crystal, solar charging, and a race-ready design at an approachable price.
Pre-orders are now available in Japan ahead of the August 2026 release.
