Since that post is quite old, I was surprised that this wasn't a reference to Bathy's recent efforts to make a wristwatch out of a chip scale atomic clock that

Since that post is quite old, I was surprised that this wasn't a reference to Bathy's recent efforts to make a wristwatch out of a chip scale atomic clock that is much closer to actual wristwatch scale (though still very large). http://www.ablogtowatch.com/bathys-hawaii-cesium-133-atomic-wrist-watch-accurate-second-1000-years/ http://www.ablogtowatch.com/bathys-hawaii-cesium-133-atomic-...