"In 1992, Bob decided to produce hand-pulled prints of the logo as a hardwood block engraving, but first he cut a test block in pine, to see how the design looked as a woodcut. He liked the test block so well that he decided to pull 50 prints, signed, numbered and hand coloured them. He gave the last of the prints to me (a few months before he died) to help sell them. Most have now been sold. Please write if you are interested in getting one of the ones left, the money goes to his family. This was one of the last pieces he did."
From Bear's Pages