I wasn't actually detecting last century but I've used a couple of machines that were made back then.
One was a tesoro golden sabre plus, great little machine on iron invested ground, not very deep but great fun to use.
The other was a White's beach Comber which I picked up in a junk shop for a tenner! I didn't actually use that one, I cleaned it up and stuck it on eBay and got 40 quid for it!