CASIO EFS-S660PB-1ADF SOLAR CHRONOGRAPH BLACK MEN WATCH

The EDIFICE EFS-S660PB-1ADF is the lighter, sportier half of the EFS-S660 pair — a motorsport chronograph in a case measuring just 38.3mm wide and 11.6mm thick, finished in grey ion plating with a black ion plated bezel and run on a resin band. At 71 grams it weighs a little over half what the steel-bracelet version does. A tachymeter runs around the bezel for calculating average speed, and the textured dial is finished to let enough light through to keep the solar cell charging.

The layout puts the chronograph seconds hand at the centre rather than on a sub-dial, so timing is read across the full width of the dial to 1/20 of a second. Running seconds move to a sub-dial instead, joined by sub-dials for stopwatch 1/20 seconds and stopwatch minutes. A red centre seconds hand is the only colour on an otherwise blacked-out watch.

Specification is above what the size and the price suggest: sapphire crystal with anti-reflective coating, an ion plated stainless steel case, 100-metre water resistance, and solar charging that runs roughly five months from a full charge with no further light.

At a Glance

• BrandCasio EDIFICE
• LineSolar Powered Chronograph
• ModelEFS-S660PB-1ADF
• Module5334
• Case Size45.3 × 38.3 × 11.6 mm
• Weight71g
• CaseGrey Ion Plated Steel
• BandResin
• GlassSapphire, Anti-Reflective
• BezelTachymeter
• Stopwatch1/20 Second
• PowerSolar Powered
• Water Resistance100m (10 BAR)

Why You'll Love It

• 38.3mm is the headline. Chronographs usually run 42mm and up because of the sub-dial layout, so a full three-register chronograph in a case this size is genuinely hard to find.
• Sapphire crystal with anti-reflective coating is a specification you normally step up several price tiers to get. It resists scratching far better than mineral glass and cuts glare when reading the dial at an angle.
• Solar charging means no battery changes and no service interval for power — roughly five months of running from a full charge even with no further light exposure.
• The centre chronograph seconds hand is a deliberate readability choice. Timing runs across the full dial rather than in a small sub-dial, which is far easier to read at a glance while doing something else.
• A tachymeter bezel turns elapsed time into average speed over a known distance — the original reason a driver's watch existed, and still the quickest way to do the calculation without a phone.
• 71 grams is the other half of the argument. A resin band instead of a steel bracelet takes nearly 60 grams off the same watch, so it stays comfortable through a long day and does not shift on the wrist while driving.
• At 11.6mm thick it slips under a cuff, so the watch works at a desk as easily as at a track day.
• Grey ion plating on the case with a black ion plated bezel gives a blacked-out finish bonded to the steel rather than laid on top, so it holds up to daily contact.
• The red centre seconds hand is the only colour on the watch, and it lands exactly where a driver's chronograph should put it.

Perfect For

• Motorsport Enthusiasts
• Smaller Wrists
• Daily Office Wear
• Business to Weekend
• Sapphire Crystal Seekers
• Solar Watch Users
• First Chronograph
• Graduation Gift

Key Features

• 1/20-second chronograph — measuring capacity of 59 minutes 59.95 seconds, with elapsed time, split time and 1st-2nd place timing. The chronograph seconds hand sits at the centre of the dial for full-width readability.
• Tachymeter bezel — calculates average speed over a known distance directly from elapsed time.
• Sapphire crystal with anti-reflective coating — high scratch resistance with reduced glare when reading the dial off-axis.
• Solar powered — charges from any light source with no battery replacement. Approximately five months of operation from a full charge until the hands stop, with a low battery alert.
• Compact 38.3mm case at 11.6mm thick — 45.3mm lug to lug and just 71 grams on the resin band.
• Grey ion plated stainless steel case with black ion plated bezel — a bonded surface treatment rather than a surface coating, on a resin band adjustable from 145mm to 215mm.
• Three-hand, three-dial layout — hour, minute and stopwatch seconds hands over sub-dials for timekeeping seconds, stopwatch 1/20 seconds and stopwatch minutes, plus a date display.
• 100-metre water resistance (10 BAR) — rated for swimming and snorkelling. Not intended for diving.
• Textured dial finish — treated for depth while still transmitting enough light to keep the solar cell charging.

Technical Specifications

The Casio EDIFICE EFS-S660PB-1ADF is a solar-powered analog chronograph on module 5334. The stainless steel case is finished in grey ion plating with a black ion plated bezel, measures 45.3 × 38.3 × 11.6mm and weighs 71 grams, with sapphire crystal carrying an anti-reflective coating, a tachymeter bezel and a resin band adjustable from 145mm to 215mm, rated to 100 metres of water resistance. The display runs three hands over three sub-dials with a date window, and the chronograph measures to 1/20 of a second with a capacity of 59 minutes 59.95 seconds. Power is solar with no battery replacement, giving approximately five months of operation from a full charge until the hands stop, and accuracy is ±20 seconds per month.

Best Matched With

• Racing Jacket
• Black Tee
• Technical Bomber
• Dark Denim
• Grey Chinos
• Driving Gloves
• Black Sneakers

Frequently Asked Questions

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