39 mm fully custom built Seiko Chronograph mod. custom built VK64 mecha-quartz movement ( meaning the seconds run off a battery and the stop watch is fully automatic movement) Tiffany Blue Chronograph dial with luminous marker and hands, Chronograph dials have second, minutes, and hours, non rotating tachymeter black bezel, screw down crowns. the Chronograph is fully functional including the stopwatch. stainless steel bracelet. brand new never worn.