Why do the clocks in classrooms have four as IIII and not IV?

Why do the clocks in classrooms have four as IIII and not IV?
Why do the clocks in classrooms have four as IIII and not IV?

Actual Romans used both, sometimes in the same document. Consistent spelling and numbering are a relatively recent phenomenon. And clockmakers are making art, so they have options on how to display things. I think it looks cool and old old-timey. Check out my friend the Oxford Classical Dictionary for a discussion: bit.ly/bc-roman