The Sheffield S20 was manufactured by Sheffield Radio Ltd in about 1936.
6-valve dual-wave set. Model code believed to be correct. Age is based on station ID's on the dial:
Absent, 1ZH ceased 1935
Absent 2ZB, 4ZB started 1937
Present 3XL, 4YO started 1934.
Original construction is quite crude, showing how far Sheffield came as a company to their well constructed and tidy sets in the 40's. Dial looks like two paint tin lids.
Photos and restoration by Tim Sanders.