Seiko Epson VS71

VS71, documented as VS71A, is an Epson solar-powered analog quartz chronograph. It has central chronograph seconds measured in one-fifth-second increments, small running seconds at 6 o’clock, a 60-minute counter at 12 o’clock and a quick-setting date. Its outside diameter is 27.60 mm with a 24.00 mm flat dimension; casing diameter is 27.00 mm and height 4.4 mm. Expected running time after full charge is approximately six months. The 2023 specification lists secondary battery unit 302334T and requires more than 20% dial light transmission. Its oscillator frequency is 32,768 Hz and rated accuracy is ±20 seconds per month.