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"Everything starts as somebody's daydream. And, when you're daydreaming, it is science fiction. It's when you start work out how you put it together, true science fiction becomes real science."
- Larry Niven

Implant-Watch  
  Subcutaneous timepiece; uses patterns of colored lights to show the time.  

This is a slick idea; I also think that there are some cool artistic possibilities here. The lights could be arranged in different patterns and colors; the wrist is not the only place you could have one. If you were really into historical realism, you could tattoo a watch on your wrist, with the implanted lights showing through.

...years ago, when Ron was flush with money from the sale of the engraved beer bottles, he'd bought an implant-watch. He told time by one red mark and two red lines glowing beneath the skin of his wrist.
From Cloak of Anarchy, by Larry Niven.
Published by Analog in 1972
Additional resources -

Personally, I have a strong attachment to the finger watch, which appeared in The Puppet Masters, by Robert Heinlein. But Niven's watch has the added advantage that you can't leave it someplace.

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Additional resources:
  More Ideas and Technology from Cloak of Anarchy
  More Ideas and Technology by Larry Niven
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