From episode #96, The Case of the Treacherous Toupee

In watching this scene, it looks like actor Frank Wilcox was surprised to not find a watch
on his arm as he nervously covers up the situation, through most of the scene, by fiddling
around with the sleeve of his robe.

The judge appears to look at his watch.

Here's a close up of the area of interest from later in the scene. No watch?

[Trivia][Perry Mason TV Series]