This is a very large professional printmaking “inking” roller, as I understand it used for woodcut or “block printing” or intaglio / etching or all kinds of other printmaking techniques. Roller is used as you can see in the photos but was owned by a professional artist and will come with the holder that is made to protect the rubber.
the rubber part is roughly 22″ long, 6″ in diameter. see photos for measurements.