This vintage reference manual for the IBM 604 Electronic Calculating Punch is a rare find for collectors and enthusiasts alike. Published in 1961, it provides detailed board wiring instructions for those interested in vintage computing. The manual is printed in the United States and is a great addition to any vintage manual collection. Condition: Very good condition. Shows minor signs of wear on the cover, spine and back, internal has some underlining and notes (typically in pencil and can be erased).  See Photos.