UBALDO, Guido. Mechanicorum liber, Pesaro: Girolamo Concordia, 1577. 2°, large woodcut vignette on title, woodcut diagrams and initials, with both blanks (lacking gathering L but supplied skilfully in early manuscript, a few outer margins lightly frayed, upper margin lightly waterstained towards the end), early vellum (slight damage to spine, recased with new endapers). FIRST EDITION. Adams U7.