AUDEMARS PIGUET ROYAL OAK CHRONOGRAPH STEEL BLACK REF. 26331ST.OO.1220ST.02 AP CAL. 2385

Brushed finished stainless steel case & bracelet with polished beveled corners.
Brushed finished hexagon design stainless steel bezel, secured with 8 polished hex-head screws. Polished polished beveled corners.
Dial:
Black main dial with the Grande Tapisserie design pattern
Silvered sub-dials with a fine snailed (concentric circle pattern) finish.
Polished white gold hands. Hour & minute baton hands with luminescent fill.
Applied polished white gold index hour markers with luminescent fill.
Dial flange on the dial perimeter with fine printed seconds & fraction of a seconds track.
Date window located between the 4 & 5 o'clock position.
Continuous running small seconds sub-dial located at the 6 o'clock position.
Chronograph function:
Column-Wheel chronograph mechanism.
Large central seconds counter hand.
30 minute sub-dial counter located at the 3 o'clock position.
12 hour sub-dial counter located at the 9 o'clock position.
AP Caliber 2385, beats at 21,600 (3 Hz) vph, composed out of 304 parts, contains 37 Jewels & has an approximate power reserve of 40 hours.