What was the world's first digital quartz watch called?

The world's first digital quartz watch was called the Pulsar.

The original Pulsar was developed by the Hamilton Watch Company and Electro/Data in the late 1960s and introduced in 1972. It used a quartz timekeeping circuit and displayed the time with red light-emitting diodes, or LEDs. Because LEDs consumed too much power for continuous display, the wearer pressed a button to illuminate the time.

The first model had an 18-karat gold case and sold for $2,100, an exceptionally high price for a wristwatch at the time. Its futuristic name, Pulsar, was chosen to evoke the newly prominent idea of rapidly rotating stars. The watch became a major symbol of early electronic consumer technology.

The Pulsar was not the first quartz timepiece overall: earlier quartz clocks and experimental watches had already existed. Its distinction was being the first commercially marketed all-electronic digital wristwatch. A later Pulsar model, the P2, gained extra fame after appearing in the 1973 James Bond film Live and Let Die.