Finding an analog chronograph that avoids looking like an oversized dashboard instrument has become increasingly difficult in recent years. Casio is directly addressing this frustration in the US with the official arrival of the Edifice EFS-S660 series, bringing two compact solar-powered models priced at $200 each.
Originally debuted in Japan, the EFS-S660D-1A and EFS-S660PB-1A prioritize understated wrist presence and durable materials over bloated smart features. By combining a scratch-resistant sapphire crystal with solar charging in a sub-39mm case, Casio offers an appealing grab-and-go option for enthusiasts tired of chunky 42mm-plus sports watches.
Compact Proportions and Premium Crystal
The primary standout feature of the EFS-S660 series lies in its conservative chassis dimensions. The case measures 38.3mm in diameter, 45.3mm lug-to-lug, and 11.6mm thick. These proportions ensure the watch sits flat under a shirt cuff without dominating smaller to medium wrists.
Despite the accessible $200 price point, Casio equipped both references with a flat sapphire crystal treated with an anti-reflective coating. In an entry-level market where standard mineral glass remains standard, the inclusion of scratch-resistant sapphire significantly enhances real-world durability. Both iterations also offer 100 meters of water resistance, making them fully capable of handling swimming, rain, and daily wear without anxiety.
Stainless Steel vs. Resin: Two Distinct Aesthetics
Casio provides two different executions to cater to varying personal styles. The heavier reference, the EFS-S660D-1A, weighs in at 129 grams. It features a classic stainless steel case paired with a matching steel link bracelet and a one-touch, three-fold deployant clasp. A subtle blue center seconds hand adds a tasteful splash of color across the dark dial texture.
For those seeking a sportier, lightweight daily carry, the EFS-S660PB-1A cuts the total weight down to just 71 grams. It replaces the metal bracelet with a flexible black resin strap and applies a gray ion-plated finish to the case alongside a black ion-plated bezel. Vivid red accents on the sub-dials and center seconds hand complete the racing-inspired look.
Solar Reliability and Stop-Watch Precision
Under the hood, both models rely on Casio solar charging technology. Light passes through the textured dial surface to energize the internal storage cell, eliminating the routine chore of battery swaps. A full charge keeps the quartz movement running smoothly for approximately five months in total darkness, supported by a built-in low-battery indicator.
The quartz module maintains an accuracy rating of ±20 seconds per month. For practical timing duties, the dial integrates three sub-dials providing a 1/20-second chronograph capable of tracking elapsed time, split intervals, and first-to-second place finishes up to 60 minutes. An integrated date window sits at the 4 o'clock position, while a classic tachymeter scale around the outer bezel allows users to calculate speed over a fixed distance.
Both the stainless steel EFS-S660D-1A and the resin-equipped EFS-S660PB-1A are available directly through Casio's official US online storefront.
