[Antipodal]

Hullo everyone,

A Zenith 6 valve set from 1937 has come across my workbench and I am hoping someone may be able to help me identify it.I think it is 1937 because it has a rubber date stamp on the  cardboard speaker  surround of that date. The octal valves are pretty standard for the time - 6A8, 6K7 , 6H6 ,6J5 or 6C5 (no identifying mark on valve)and 6F6 output tube. The rectifier is a little unusual , though , being a 5Y4. 
Some time ago faced with a similar problem a Phorum member was kind enough to send me a link which outlined all the radios that used a particular valve lineup.I'm hoping that they might send me that link again. 
It has a 6 inch e.m. speaker with both field and output transformer primary intact. On the back is an aluminium tag listing the serial number as R555222.Inside the chassis at the back is a green printed cardboard label bearing the code R250. If anyone can throw any light on what model Zenith this is I would be most grateful. Cheers, everyone