Answer
The Sinclair Radionics Black Watch, introduced in 1975, was a pioneering effort from Sir Clive Sinclair's company Sinclair Radionics. Aimed at the consumer electronics market, it showcased a slim and stylish design, featuring a unique "black dial" display and a built-in speaker for alarms. Despite initial enthusiasm and promotion as a fashionable accessory, the watch faced numerous challenges, including production difficulties, reliability issues, and competition from more conventional watch designs.