You're right, I forgot about the 73. Some of them were a standard threaded spindle. I think 5C or 8W collets was an option at the time of purchase. Wade was always a small company, and seems to have been willing to make whatever the customer wanted.
I have serial number books for the 94 and 98 lathes... if you want, PM me the number of your 94 and I'll see if it's in there. Same goes for you, Cal.
8A production records were, unfortunately, thrown out about ten years ago.