Panerai Luminor 1950 8 Days GMT Monopulsante Chronograph PAM 317 Black Ceramic Movement is made by Panerai in house Panerai Calibre P.2004. Manual winding mechanical 8 day power reserve. 1950 Case, Case size 44mm, GMT, second time zone and a seconds hand on the main dial. It has a thirty minute counter on a sub-dial at 3 o'clock and day-night indicator and sixty second counter in a sub-dial at the 9 o'clock position. At the 6 o'clock position there is a horizontal power reserve indicator. Any questions just let me know. Thanks!