jaquet+droz Jaquet Droz Seule Aiguille WatchThe Jaquet Droz Seule Aiguille watch is one of the most distinctively elegant timepieces to debut at Basel this year. Its French name alludes to its single blued steel hour hand, which completes a revolution around the dial once every 24 hours. But how do you tell the minutes? And you have to estimate to the nearest quarter, by using the hash marks between the hours.