Some people like to get all the accessories for their suplus rifles, but this takes it to a new level. ;D I got a call sometime back from my father who was service manager, now retired, for a local office equipment dealer, Cannon, IBM etc. He told me to bring my M1 Carbines over, as he had something special. He had a Underwood Type 6 typewriter It's roughly the same circa as my Underwood M1 Carbine, the Carbine is barrel dated 11-43, he estimates the typewriter is a prewar or possibly made at the very beginning of World War 2. This would have been close to what office equipment the military would have been using during the time frame.
The first models according to him had glass key buttons, later models use matte type buttons and share the same mechanism as the Champion model. The Champion model made Underwood victor in 26 World's Typewriter Championships in the 27 years of competition. The Underwood typewriter needs a little TLC, but all the keys work, and even the bell still dings, the carriage returns normally, and in good working condition command a fairly hefty price tag.