Not sure how this works then, as we know Skloexport (Glassexport) appeared in 1948. There does not appear to be any other organisation handling export, other than Jablonex. Certain small companies, (less than 50 employees) were still advertising in early 1948, in CGR, as exporting from the Jablonec region.
Is Vitrea London, a wholly-owned Czechoslovakian subsidiary, in which case, why employ Downey as a designer?
Do you have a pre-war gazetteer from PG and GTR, Frank, and is there any mention of Vitrea, pre-war?
Thanks and regards,