Found by Ian Suddaby

This example is not in my possession.

Alpha – Millstone Fire and Grit Co, Herbertshire Brickworks.

According to Falkirk Museums and Archives  FMA  –  Alpha bricks were a product of the Millstone Fire and Grit Co. Incorporated in 1966 and took over the common brickworks at Herbertshire, Denny. Worked open cast fireclay pits at Threaprigg and Slamannan Plateau. Merged with Burn Fireclay Co of Morpeth in 1979 and Herbertshire Brickworks closed.


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