I think this is the one... picture#1
Aka RCA VS300.
Sorry about the crummy pix... I did not want to scan the fragile book.
My wife's first transistor radio (RCA 7-BT-9J) uses such a cell... I just made a little "jumper" and use a standard 9V alkaline battery, with a little foam around it so it won't rattle. The smaller alkaline batteries available today last much longer than the original battery did.
http://transistorhistory.50webs.com/rca1st.html
jr