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A watch equipped with a mechanism invented by Breguet that enabled the wearer to tell the time by touch alone. A pointer on the outside of the case echoes the position of the hour hand of the watch. After feeling the position of this pointer, the wearer can deduce the time from its position in relation to studs positioned to align with the hours. Available to buy from 1799, the tact watch (sometimes known as the “watch for the blind”) was to lend itself to a great wealth and variety of embellishment, including enamel, pearls and diamonds. With a few exceptions, the tact system was confined (for obvious reasons) to simple, non-striking watches.