That coin was part of an ancient collection, perhaps was part of a museum. Usually they used to mark their artifacts with small labels like that or directly writed on the surface of the coin.
Prior to the invention of 2x2s, coins were frequently identified with tags in coin trays and cabinets and had the numbers actually written onto the coin, with ink, so the coin could be put back in its proper place.
Modern collectors don't do this, of course, but the numbers are usually not removed by people who own the coins today - the numbers are, after all, a mark of provenance - a sign that the coin has in fact been in collections for 80 years or more - even if the exact details of the collection it used to belong to have now been lost.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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