I got this plate somewhere around 1967 or 68. I had built a tree fort in the back yard, and a woman from the apartments behind our house asked if we wanted some old plates for our fort. We took a stack of 10 or 12 from her, then my mother took them from us. The monk plate was one of them. I have no idea if it is worth anything, but one of the other plates in the stack has a current value of about $350. The monk plate is currently in my basement with a collection of German beer steins.
Click on the image below for a close up, the detail is really good. I gimped the cheesehead for my avatar.