Found in Falkirk.

Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge.
Calder Firebrick Works, Airdrie, Lanarkshire.
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 – A very similar stamp on a brick  1 1/2″wide. Found in Glasgow.

Below – A very similar stamp on a brick found at the old Calder Ironworks site.  Note the diamond/ square impression to the right-hand side. It is not clear from the photo but there is a very faint screw impression to the left side. (Note – SBH – I suspect the screw holding the stamping plate to the mould came lose or broke and a square-headed bolt was used to replace it and this left the mark as detailed.)

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