The first Pulsar was a brand of The Hamilton Watch Company which announced that it was making the watch in early 1970. It was developed jointly by Hamilton and Electro/Data, Inc. In the spring of 1972,  the first Pulsar watch was marketed by The Hamilton Watch Co. (the parent company, not the Hamilton Watch Division). With an 18 carat gold case, the world’s first all-electronic digital watch was also the first to use a digital display — created with LEDs.  A button was pressed to display the time. The first Pulsar initially sold for $2100 ($12,100 in 2012 dollars).

In 1975 a digital Pulsar with a built-in calculator (operated with very small buttons) was introduced.

Seiko Corporation acquired the brand in 1978. The Pulsar brand serves as Seiko’s mid-grade offering and is positioned above the Lorus brand and below the Seiko brand of watches.

Info gleaned from Wikipedia