Baselworld 2012: Regatta complications have never been my forté, but the Louis Vuitton Tambour Spin Time is rather interesting.
The Tambour Spin Time movement uses cubes at the hour indicators that tumble to show a blank side or a numbered side that can be used to time race countdowns.
The Tambour Regatta America’s Cup Automatic and the Tambour Regatta America’s Cup Quartz are the two new watches for the collection and are in 44 mm steel case and molded rubber that encloses a regatta function and V Dubois Dépraz caliber fully configured to time any regatta event. The Tambour Regatta America’s Cup Automatic is limited to 720 units.
Given this watch has cubes for hour markers, you should be able to narrow the countdown time to the square minute.