Illustration. The seconds hand ticks, as most quartz movements do.

Edifice EFS-S660 Solar Chronograph

Name: Casio Edifice EFS-S660 Solar Chronograph
Brand: Casio

Ref. EFS-S660D-1A

Also EFS-S660D-1AJF, EFS-S660D-1AEF

Anthracite honeycomb dial, blue chronograph hand, inner tachymeter, steel bracelet

Diameter: 38.3 mm
Thickness: 11.6 mm
Water: 100 m
Movement: Module 5334

€199

Price on Casio's German, Dutch and Spanish stores as reported by Notebookcheck (August 2026); ¥33,000 in Japan, USD 200 in the US.

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Why it's interesting

Casio shrinks the racing chronograph to 38.3 mm and adds sapphire, solar charging and a honeycomb dial that lets light through to the cell beneath. A sensible, compact answer to the oversized chronographs that usually wear the motorsport look.

Watch DNA. Filled tags are editorial; outlined tags come from the specifications.

The numbers

Verified specifications

Size

Diameter: 38.3mm
Lug to lug: 45.3mm
Thickness: 11.6mm
Lug width: —

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Chosen for shape, size, colour, character and price. Rarely the same brand twice.

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About this page

Verified specifications, checked September 2026

Dimensions, water resistance, movement and crystal were checked against the sources below.

Case 45.3 × 38.3 × 11.6 mm, 129 g, 100 m, sapphire, solar power and the August 2026 launch from Casio's Hong Kong online flagship store (casio.com returned 403). Calibre 5334 per Notebookcheck and Sakura Watches. Sub-dial functions (1/20 s at 12, running seconds at 9, stopwatch minutes at 6) follow Gizmochina and the product photo. The tachymeter is printed on the black inner flange inside a polished steel bezel; it's drawn as a tachymeter bezel insert, and the honeycomb dial texture as a fine grain. Lug width unpublished (integrated bracelet).