Case in steel with a delicately fluted caseband. Sapphire-crystal caseback. 42mm diameter. Bidirectional rotating bezel. Rounded lugs. Screw-locked crown. Water-resistant to 10 bar (100m).
Dial slate grey, signed Breguet. Hours chapter with luminescent Arabic numerals. Day/night indicator at 3 o’clock. 12-hour totalizer and date at 6 o’clock. Small seconds at 9 o’clock. Central minute totalizer. Luminescent hands and dots. 
Self-winding chronograph movement, with “flyback” function. Numbered and signed Breguet. Cal. 584Q/2. 131/2 lignes, 26 jewels. 48 hours power reserve. Inverted in-line Swiss lever escapement with silicon pallets. Silicon balance-spring. Balance frequency 4Hz. Adjusted in 6 positions.
Strap in calfskin leather.

Reference: 3817ST/X2/3ZU