When were digital watches invented?

In 1957, The Hamilton Watch Co of Lancaster, Pennsylvania, produced the world's first electric watch. The Hamilton Electric Watch kept time with a traditional balance-wheel mechanism which had been used in timepieces for hundreds of years and was therefore no more accurate than any other watch. However, instead of the mainspring powering the mechanism, a battery was used to power the mechanism so the need to wind was eliminated.

Although people loved the fact that they no longer had to wind the watch, it would stop when the electric contacts became worn - which happened not long into the watch's lifespan. It was a headache that the Hamilton repair department continually faced until the watch was updated in 1961.

BUT in 1972, Hamilton produced the first watch with a digital display.
in 1970 by the hamilton watch company in the USA by John bergey and his super watch making team!!! its true!!!