I have two clocks and a wristwatch. It wasn’t easy to find a wristwatch with Roman numerals, but it was worth the hunt. There are some multivolume books around here with Roman numerals. I also have a bronze medallion with IX on it.
I’m guessing that there’s a convention for timekeeping devices to use IIII in place of IV for 4 so it won’t be a confusing mirror image of VI, especially since the VI is at the bottom and typically upside down. I don’t think there’s anything ironic about it.
I used to have some T-shirts with “Asilomar” and various Roman numerals on them, but it’s been a while.