As you can tell from the description, the card can be read many times, but only written to once. Via a combination of ...

[John Graham-Cumming] might not be the first person to thumb through an old book and find an IBM punched card inside. But he might be the first to actually track down the origin of the cards.

A postcard written by a first-class passenger on the ... scrawled a message in pencil to a Mrs Olive Dakin in Norwich, England. The card is postmarked 3.45 p.m., April 11, 1912 – three days ...