Seiko Epson YN84

S. Epson YN84 is a Japanese automatic movement with 22 jewels, manual winding and stop-seconds. It has central hours, minutes and seconds, a power-reserve indicator and a coupled 24-hour display, rather than an independently adjustable GMT hand. The secondary exact-calibre reference specifies a 27.4 mm diameter, 5.32 mm height and 21,600 beats per hour. Vostok Europe specifies 40+ hours of running autonomy; 40 hours here represents the published minimum. An opening at 9 o’clock can expose the balance depending on the watch dial.