[This](https://maps.nls.uk/view/130376074) local OS map has it clearly marked (L.B = Letterbox) as of 1956 but the first industrial building there was probably the Olivetti typewriter works (just south of the "Valve Factory" in the OS map). which opened in 1949.
Queenslie itself was basically built as a small scheme for the workers so I bet you that's why it's a George VI postbox. |