Banned Books Coffee Mug by Unemployed Philosophers Guild 2015

What a great find. In excellent condition with no chips, cracks, or stir marks inside. It is the BANNED BOOKS mug from: Presents of Mind Unemployed Philosophers Guild www.philosophersguild.com Brooklyn, New York Dishwasher and microwave safe Made in China. 2015 #4574. This number means something but after researching I still don't have a clue. It holds about 12 oz. The colors are beautiful but muted. The word BANNEDis raised on the front of the mug.