1.25" w/slight loss on text from the W&H 1900 back paper, but their name remains clear. Front text reads "International Convention/I. P. P. & A. U./Milwaukee 1900". These initials represent International Printing Pressmen & Assistants Union. The cartoon, with a "burst" design outer edge, shows worktable at left with a large ink roller with handles sitting on a red rectangular plate. To the  right is the stocky, older, master craftsman with his sleeves rolled up, wearing a work apron with four (one of two in yellow is hard to discern) ink handprints on the front. His left hand holds a tall clear glass full of beer with a foamy head. His right hand holds the tin beer pail, and his kneeling  assistant is attempting to catch in his mouth a drip of beer sloshing over the rim. Both men are wearing wood clogs (sabots), a shoe associated with the working classes during the Industrial Revolution and a sometime used symbol of Socialists of this 1900 era. Button has stain, mostly outer edge, and two pinpoint pricks into the cello. One below beer pail, one below beer mug. Button retains color intensity and cello has full gloss. One of three known to us.