Silverstone time zone gulf silver has one main characteristic that differentiates it from other graham watches it is much smaller still the timepiece comes with all of the features and complications typical for graham its calibre is g1714 automatic the watch performs 28 800 vibrations per hour it comes with incabloc shock absorber 21 jewels and 42 hour power reserve the functions include gmtsecond time zone and a date window located at the7 oclock mark hands mark hours minutes and