The windowed envelope below has a red meter mark for Astra Chemicals, who manufactured Calciferol, a vitamin D2 supplement. It is dated 30th May 1952.
Two and a half months later Dulverton suffered a heavy flood, part of the same weather system that flooded and killed 34 people in Lynmouth. Astra Chemicals at Dulverton were badly affected, though put up a poster bearing the words "Business as Usual" whilst warning clients that there might be some delay in dealing with correspondence.
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