"I've read that pumpkin juice is a favorite drink of wizards and witches. I haven't tried it myself, but I thought it would be fun to design a lapel pin that looks like a pumpkin juice bottle cap." - Rather Keen
It's the same size as a real cap, with a 3-D wiggly edge, and the back is even recessed a bit. I custom-lettered the word "Pumpkin" for a peppy mid-century soda pop look.
The pin uses orange hard enamel, in gold or silver metal.