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Found Manuel Works, Whitecross.

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.

Below – Similar stamp on a shaped special. Found at Drum Farm, Bonnybridge.

Below – A similar stamp on a brick found in the Glasgow area. Note ‘C’ appears to have become dislodge or unattached in theh mould or on the stamping plate.

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