This IBM Field Engineering Handbook is a valuable resource for anyone interested in vintage computing. The manual case is a must-have for collectors and enthusiasts alike. The brand is IBM, and the type is User Manual Case. This custom bundle includes all the necessary manuals for the 1981, 84, and 88 models. The case is made in the United States, and it has not been modified. The vintage manuals are a great addition to any collection, and this item is sure to be a prized possession for years to come.