The Ebay description says the 37 was used in 1967...isn't that a bit of a stretch? And, it also says it was used for MARS, which implies it can also operate Baudot (there were 37's with speed/code converter circuit boards). If this machine was used for the "Hotline" it probabaly was Baudot at 66 wpm?? Professor Haynes???? Jack WA2HWJ