Nevertheless, I see that Decwriter II was not a true teletype. It was a teletype emulator derived from a dot-matrix printer and it was introduced very late in the evolution of computers, in 1974, at a time when the true teletypes had already become obsolete and more than two decades after the line printers that have established the standard width of 132 characters.
Decwriter II could provide a width of 132 characters only because the dot-matrix printer on which it was based was built to be able to use the standard line printer continuous perforated paper of 14 inches, like most other dot-matrix printers.
It is likely that Decwriter II has been used much more often as a remote teleprinter than as an interactive teletype and in the latter case it was used only because some users were forced to use it because their bosses did not buy decent computer terminals for them.