[russell_w_b]

The wall shelf for a 200 series instrument was actually a snazzy-looking Bakelite job; there's a photograph of one in 'Atkinson', Vol:1.

When I worked at British Steel's DEC works at Workington in the 1970s, the works PAX had many 300 series instruments as extensions, but no wall-versions that I recall. But most of the telephones were wall-mounted, on lovely varnished wooden shelves produced in the pattern shop.