“A tramp printer was a typesetting troubadour who came to town with a story in lieu of a song — an itinerant scholar and a master of the typecase. Carrying a union journeyman’s card and little else, these train-hopping typographers criss-crossed the continent by foot and rail for more than a century. To the tramp printers, freedom and the open road were far more valuable than material possessions.”
A person who is either skilled in the technique and art of typography and/or very knowledgable in this area, e.g. in regards to the history of printing with moveable type, typefaces and so on.