Serial number in the 1900s. In 1970, Hamilton revolutionized time display in watches with the "Hamilton Pulsar." And now, 50 years later, the "Hamilton PSR" arrives, celebrating the birth of the world's first LED digital watch. A hybrid display and stainless steel case bring this innovative timepiece back to the present. The design is based on the "P2" released in 1973, recreating the iconic wide cushion-shaped case. The size is also the same as the original, at 40.8mm x 34.7mm. While the crystal has been updated from ruby to sapphire crystal, it retains the same three-dimensional form as the original model, giving it a retro-future feel. A hybrid display combining LCD and OLED technology is also a feature. The LCD allows for constant display, and the combination with OLED allows the red 7-segment LED to illuminate with the push of a button on the right side of the case. This yellow gold PVD model is limited to 1970 pieces and comes with a limited edition box. Movement: Quartz, battery-powered Band: Stainless steel band Dial Shape: Square Color: Gold