Found Firth of Clyde, Glasgow.

Brickmark states Alumina.

The mark is on a curve with the letters at either end being the smallest and rising to the top of the M.

Find location would suggest Scottish origins but….

Possibly an early  Eglinton brick or a James Dougall & Son brick or a Douglas brick or indeed a Stein brick….Yes you have guessed it …I do not know!




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