Calder brick found at Saint John, New Brunswick, Canada

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Found by Robert H.J. Shears at Saint John, New Brunswick, Canada.

Robert states – “I am an archaeologist conducting artifact research following a mitigation project on the site of an 1840’s period jail house in Saint John, New Brunswick, Canada. A yellow clay brick stamped with ‘Calder’ was recovered among other late-nineteenth to mid-twentieth C material within the demolition fill of the jail building”

Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge.
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Calder Firebrick Works, Airdrie, Lanarkshire.
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Chapelhall Works, Lanarkshire.

Hepworth Ceramic Holdings plc (GR-Stein Refractories Ltd. parent co) bought the Bonnybridge Silica & Fireclay Co. Ltd in 1972, closed Bonnybridge works in 1973 and closed Chapelhall in 1980. Therefore between 1972 and 1980, GR-Stein Refractories probably continued to manufacture bricks with this trademark for a time.

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