In the late 1970s, banks began introducing 'Cash Cards'. Here is my original National Westminster version. However, they were strictly for emergencies only. You put the card in a hole in the wall and it dispensed exactly £10. But it kept the card, which was then mailed back to you in the wallet, as shown - stamped and signed!! Notice also the computer 'punch card' holes.
I wonder if there's a memorabilia site might be interested in this?
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