"Roman numerals are one of the most classic designs found on clocks and watches. As far as we can go back in history, there have always been clocks, pocket watches and wristwatches with Roman numerals on the dials. However, owners of watches with Roman numerals might have noticed something weird, something rather unusual. While the numeral 4 is commonly written IV in the Roman numeric system, most watches rely on the typography IIII. And of course, just like us, you might have asked yourself why? As always, there is no single answer to a problem, but here are some possible explanations for this absurdly important question."

https://monochrome-watches.com/why-do-c ... ead-of-iv/

Because people are idiots. Have hard passed on many a watch with this “feature.”