Longines heritage gents chronograph watchmovement and functions caliber l688 self winding mechanical column wheel chronograph movement beating at 28800 vibrations per hours and providing 54 hours of power reservefunction hours minutes small second at 9 oclock and date chronograph mechanism central 60 seconds hand 30 minutes counter at 3 oclock 12 hours counter at 6 oclockcase shape roundmaterial stainless steelglass scratch resistant sapphire crystal with several layers of