Found at Drum Farm,Bonnybridge.

This is a feathered brick.

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 – The same stamp on a narrow brick found at the same location, although the ‘frog’ seems to have squared ends in this version.

Below – Basically the same stamp found on a large special slab type – approx 20″x 16″ x 6″ – left in situ at The Coltness Irons Works, Newmains.

Below – Basically the same stamp on a large curved special. Left in situ at the Calder Iron Works, Coatbridge.



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