1440 minutes in one day
86,400 seconds per day

Show  the minutes of the day in binary
( requires 11 bits, 11 LEDs or annunciators )
Show  the seconds of the day
( requires 17  bits, 17 LEDs or annunciators )

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Have a vibrator that reports the time inaudibly using finger touch to  
activate the watch and a finger to sense the time reported in binary  
or some other code.
pulse medium =1  pulse short = 0  pulse long = delimiter

example 1:    medium short medium long medium short short short  = 5:08

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play low level audio tones that require user to put watch up to ear.
( shades of close encounters    http://www.wavcentral.com/sounds/ 
movies/closenc/close02.mp3 )

cc 
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