EFV-640D-2AVUDF

The Casio Edifice EFV-640D-2AVUDF is the blue dial version of the octagonal series you’re looking at. It features a deep navy blue sunray dial that contrasts sharply with the silver stainless steel “flat-top” bezel.

Core Specifications
Design: Slim, octagonal stainless steel case with a matching stainless steel bracelet.
Case Size: 47 × 44.3 × 10.8 mm (notably slim for a chronograph).
Weight: Approximately 136g.
Water Resistance: 100 meters (10 bar), suitable for swimming.
Movement: Quartz with an accuracy of ±20 seconds per month.
Key Features
1/10-Second Chronograph: A more precise stopwatch than the EFV-630 series, measuring up to 60 minutes.
Sub-dials: Top sub-dial for 1/10-seconds, bottom for stopwatch seconds, and left for stopwatch minutes.
Date Window: Positioned at the 3 o’clock mark.
Durability: Mineral glass and a screw-lock case back.