[Arran]

I thought that the true Brand Z Zephyr sets were 1937 models? The kind with the black, back lit, celluloid dial that has a knob on all four corners of the dial escutcheon. I think that your offer was somewhere in the ballpark, maybe up to $200 at the most given that it needs plastic parts replaced, and if you really like it. A small amount of internet research indicates that this model isn't really that rare, the original retail price was only around $100, it also only has nine tubes and a single ended output stage. It does have have a rather nice cabinet, unfortunately it is also full of rubber covered wire under the chassis.
Regards
Arran