I'm not sure it does. Except the curtain from which the arm protudes could be a stage curtain, true. Well, there is a laurel wreath surrounding the oval drawing of the curtain and the writing arm. And on that laurel wreath are written these words in Latin. Those two phrases could translate as something like this.
Credulity is strained.
Enough to turn you off and tune you out. There are well-documented cases. The severed hand of John Stubbs comes to mind. I think of Simple Simon's reply to the pieman when asked for a penny. Indeed, I have not any.