Casio has expanded its US watch lineup with the release of two new Edifice EFS-S660 models. Initially launched in Japan this past August, the EFS-S660D-1A and EFS-S660PB-1A are now available on the company’s US website for $200. The release adds a pair of straightforward, solar-powered analog chronographs to the market, focusing on standard materials and a smaller form factor rather than smart features or oversized designs.

Design Details

The primary differentiator for the EFS-S660 series is its size. The watches feature a compact case measuring 38.3mm in diameter, 45.3mm lug-to-lug, and 11.6mm thick. This is a smaller footprint compared to many contemporary chronographs, which often exceed 40mm or even 42mm.

Casio has equipped both models with a sapphire crystal that includes an anti-reflective coating, a material choice that provides better scratch resistance than the mineral glass typically found on watches in this price bracket. Both models also include a standard 100-meter water resistance rating.

Casio is offering the watch in two distinct configurations. The EFS-S660D-1A is the heavier of the two at 129 grams, featuring a standard stainless steel case and a matching stainless steel bracelet with a one-touch, three-fold clasp. It uses a blue center seconds hand for visual contrast against the dark dial.

The EFS-S660PB-1A is a lighter variant at 71 grams, swapping the steel band for a black resin strap. It features a gray ion-plated case, a black ion-plated bezel, and a red center seconds hand.

Internally, both watches use Casio’s solar charging system. The textured dial allows ambient light to reach the solar panel underneath, which then charges the internal battery. The watches can run for around five months on a full charge before the hands stop moving. They also feature a low battery alert that lets users know when the watch needs more light exposure. The quartz movement is rated for an accuracy of ±20 seconds per month.

For timing, the watches feature a 1/20-second stopwatch that can measure elapsed time, split times, and first- and second-place finishes for up to nearly an hour. The dial includes three standard hands, a date window, and three sub-dials for regular seconds, stopwatch minutes, and 1/20-second measurements. Casio has also added a tachymeter scale around the outer bezel, which can be used to calculate speed based on travel time.

In related news, Casio has recently launched three premium Oceanus OCW-P3000 watches featuring a clever world-time bezel, along with two new G-Shock 5600 models equipped with MIP displays, Bluetooth connectivity, and solar charging.

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(Casio 1,2)

Casio has announced three new models in its Oceanus line, scheduled for release in Japan in October 2026. The new Cachalot OCW-P3000 series includes the OCW-P3000-2A, OCW-P3000-3A, and the OCW-P3000B-1A. Rather than relying on digital displays or complex sub-menus to manage multiple time zones, these watches use a physical system that Casio calls the Time Zone Navigator.

Design Details

The setup process is fairly straightforward. When you press a button on the side of the watch, the seconds hand moves to point at a city on the dial where the local time is currently midnight. You then manually rotate the bezel so its triangle marker aligns with the seconds hand.

Once that is set, the 24-hour scale on the bezel lines up with the 26 city codes around the dial, letting you read the time in those locations at a glance. The bezel itself uses a ceramic insert with a two-tone design to separate daytime and nighttime hours.

Because the case and bracelet are made entirely of titanium, the watches are relatively light at 99 grams, despite their 47.6 x 42.9 x 11.7 mm dimensions. The two standard models (2A and 3A) have a titanium carbide treatment, while the 1A model features a Diamond-Like Carbon (DLC) coating for better scratch resistance.

The dial is covered by a sapphire crystal with an anti-reflective coating on both sides. Casio also adjusted the solar panel layout so the sub-dial can use opaque materials for better color contrast, without blocking the light needed to charge the battery.

Internally, the watches run on Casio’s Tough Movement 2. It is a solar-powered analog movement that keeps time accurate by syncing with the Casio Watches app over Bluetooth. If you don’t have your phone connected, it defaults to receiving Multiband 6 radio signals.

The movement also has built-in protections against physical shocks and magnetic fields. If the watch takes a hard impact that knocks the hands out of alignment, a shock detection system automatically corrects them.

Similarly, a magnetic field sensor will temporarily freeze the hands if it detects strong interference to prevent the alignment from shifting, and it resumes normal operation once the magnetic field is gone. On a full charge, the battery lasts about five months under normal use, or up to 23 months with the power-saving mode turned on.

Pricing and Availability

The OCW-P3000-2A and 3A will cost ¥220,000 ($1,410), and the DLC-coated OCW-P3000B-1A will be priced at ¥253,000 ($1,622) when they go on sale next month.

In related news, Citizen has recently launched a super-premium red-dial Eco-Drive watch limited to just 350 pieces, alongside a 1970s-inspired gold-tone Zenshin watch with a Super Titanium build.

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(Casio 1,2,3)