Hi,
The architectural use of black Vitrolite panels, with engraved or sandblasted decoration, was relatively common in the 1930's, both for large-scale projects, and smaller commissioned works for domestic interiors.
Panels of this type were also used in the outfitting of some new trans-atlantic liners, and vessels on the UK-South Africa-Australian routes.
Certainly examples are to be found in the "Studio" year-books of that period.
Regards,
Marcus