Hamilton Watch in Lancaster, Pennsylvania USA developed the Pulsar, the world's first digital watch. The Pulsar P1 was launched in 1972, followed by the P2 and the P3 was introduced in late 1973 [1]. The latter remained in production at least until late 1975 [1]. In 1978, Seiko Corporation acquired the Pulsar brand.

This Pulsar P3 has its original Gold Filled strap with a magnet compartment. 

This is a fantastic example in excellent condition, working perfectly and keeping very accurate time. Includes it's Pulsar Box.

The Pulsar P3 is set in a unique way by placing a magnet in one of its two recesses MIN and HR. Setting instructions: http://www.oldpulsars.com/magnet.htm