Judge Ruined Clock Tattoo!

In the season 2 episode "True Love", Allie was tattooing a grandfather clock and Joe the judge came over and freaked out telling her that she had screwed up the roman numerals and that the number four should be "IV" instead of "IIII". While this is generally true of roman numerals, IT IS NOT TRUE FOR CLOCKS! Clocks almost always use IIII instead of IV. Allie's reference material wasn't wrong as Joe suggested. Joe was wrong. He opened his mouth for no reason and screwed up the tattoo. I would think that a tattoo artist would know how to draw a clock face, but if he didn't, I would think that he wouldn't involve himself until he actually knew what he was talking about.