The first ATM was unveiled by Barclays at their Enfield branch in north London on June 27, 1967.
"The invention of the ATM was a historical moment that completely changed the way the world thought about and used cash," Barclays said.
The original cash machine was the brainchild of John Shepherd-Barron, who was commissioned by the bank to create six cash dispensers. They were based on vending machines.
Customers could access their money outside of banking hours -- a mini-revolution on the high street.
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The Barclays cashpoint in Enfield has been given a gold makeover, and a roped-off red carpet approach to celebrate the anniversary.
A black-and-white picture of Varney using the ATM stands above it, while a commemorative gold plaque has been placed on the bank wall.
There now are an estimated three million plus cash machines on the planet.
The world's most southerly ATM is at the McMurdo Station research base on Antarctica, while the highest is at 4,693 metres in Pakistan's Khunjerab Pass near the Chinese border.
Though other technologies such as mobile and online banking have come into play, the number of cash machines is expected to grow, with China and India driving the expansion.
The Payments UK trade association recently predicted that the rapid growth in the use of contactless cards means cash will be overtaken as Britain's most frequently-used payment method by the end of next year.
But in 10 years, it is still expected to make up around a fifth of all payments in Britain.
The British record for the most cash withdrawn in a single day was broken last December as Christmas shoppers withdrew 730 million pounds (USD 935 million), according to industry figures.