In 1970, Pulsar was a brand of the American watch company Hamilton, which first announced that it was manufacturing and marketing the LED watch. It was jointly developed by the American companies Hamilton and Electro/Data.With an 18-karat gold case, it is the world's first all-electronic digital watch and the first to use a digital display created with light-emitting diodes (LEDs). In 1975, a digital Pulsar with a built-in calculator was launched. Now the Pulsar brand is a division of Seiko Watch Corporation of America. Current Pulsar watches are mostly analog and use the same Seiko movements as the quartz chronograph.