It comes with the original manual, copyright 1973. It has the optional LED display and it still works perfectly. It's missing the carrying case though. This thing really is built like a tank. What a blast from the past. It reminds me of the old mechanical adding machines at the repair shop I used to deliver for in 1977, except this thing is a scientific calculator. I have no idea where I'm going to put it. Update: the serial number is: 1314A02082
Edited: 16 July 2008, 2:08 p.m. after one or more responses were posted