Pulsar was the brand name of The Time Computer Inc. of Lancaster, Pennsylvania, formerly the Hamilton Watch Company.
In 1970 Hamilton revealed during a press conference a watch that showed the time in numerical digits using a light emitting diode display, or LED. A power source battery fuels the quartz crystal to vibrate. The vibrations are then translated by an integrated circuit into information for the display. When a button is pushed the time shines in bright red-light numerals on the synthetic ruby "time screen" or dial for a short period of time (1.1 seconds). This watch has no moving parts and was the first ever 'solid state' model.
The futuristic "time computer" is named Pulsar after pulsing stars in astronomy giving off bursts of energy. It became an instant hit and "the watch to have" amongst politicians, movie stars, entertainers and many other public figures.