The graham chronofighter watches get noticed instantly because of their rugged design and impeccable mechanism the chronofighter oversize big date gmt watch comes with automatic bi compax chronograph g1733 calibre it performs 28 800 vibrations per hour additional features include incabloc shock absorber 28 jewels and a 48 hour power reserve the timepiece makes use of a number of complications like gmtsecond time zone a chronograph and a double date window at the 12 oclock position hands