THE CLEARSTART ANALOGUE WATCH from Ronstan has analogue quartz chronograph movement.  It’s 43mm diameter brushed matte-black stainless-steel case and hard mineral crystal lens make it strong and durable.  It has 12- and 24-hour time with date window, and a stopwatch (60 sec and 10 min).

Most importantly, for yacht racing starts it has a five-minute countdown, and is water resistant to 10 ATM (100m/300ft). It weighs 90g (3.2oz)