We demonstrate our fully restored Model 19 Teletype (from 1940) talking to a Model 15 Teletype (from 1930). This is a demonstration format, from the user operation point of view, to wrap up the restoration. The explanation of how the selector works is new; however, most features were already covered in much more detail as we restored them one by one through many previous videos. The patient folks who learned it all through the restoration process  might know most of this already, and much more. And of course Teletype subsidiary of AT&T manufacturing arm Western Electric, not hard disk maker Western Digital... Oh my old brain.