This limited edition flyback chronograph has been produced in a series of 500 pieces its calibre is g1721 automatic bi compax chronograph it makes 28 800 vibrations per hour additional features include the incabloc shock absorber 28 jewels and a 48 hour power reserve the chronograph has seconds and a 30 minute counter the watch comes with several other complications like gmtsecond time zone a tachymeter and a double date window at the 6 oclock position hands mark hours minutes and sec