I can't find the thread where this was raised. Someone found a picture in an old computer magazine online of the terminal, and wondered what it was like.
It was noted in the thread that the display was like one of the smaller ones available for the IBM 3277 Display Station.
I thought I noted that I believed I had seen a picture of that terminal's keyboard in the book Design of Man-Computer Dialogues by James Martin (Prentice Hall) that was clear enough to see what the keys were.
Well, I finally found my copy of that book, and yes, it is in there. On page 153 of the first edition.
But I can't find the thread to reply to the person with the question!
The keyboard had 10 rows of 17 keys, with an extra row on the bottom with only 8 keys, some double-width, and some spaces between keys.