Re: Cribs from touch
The other type of personalization was the Morse code sending itself.
Yes, but that was for the people listening to pick up. Most of those were ordinary citizens that had (or got) a suitable receiver, with motorcycle messengers collecting the messages that were copied down. They did get told, if not trained, to spot particular operators by their keying. And of course particular Wehrmacht and Kriegsmarine stations were listened to by army staff radio operators, with a quicker way to get interesting messages to the code breakers.