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1974 IBM Mainframe Field Engineering Manual. For 3872 Modem. The Manual is very large and the pages bright. You can even remove some of the diagram for framing. The Manual is a ring binder type. This manual included everything a field technician would need for maintenance, installation or repair. Logic charts, assembly diagrams, even proper scope wave forms for dianostics. I found these in a small locked room while renovating our datacenter. And for a passionate collector such as my self I was blown away! It was if I stumbled into a time capsule. And they are rare, I don't use that term lightly. Why so rare? Because such manuals we're always return to IBM for distruction after the unit was retired. Few remain in the "Wild". I am rating the condition as "good" considering the item is over 45 years old! I have about 20 of these manuals ranging from 1968-1985. Some I donated to my local computer mesuem, some I kept in my personal collection. And some I've decided to sell to fellow collectors whom can appreciate the history behind them. In short I feel these are simply to rare to keep all of them in my personal collection. This one is from 1974. When the iron curtian was up, the Cold War was hot, NASA was wrapping up the Apollo program and IBM "Big Blue" was still selling "Big Iron". If you're a passionate collector such has my self, and can appreciate computer history then don't pass this opportunity up! All my items ship within 48 hours of payment. If you have any questions or would like to see more photos please reach out. Good Luck!