Found by Bill Duff in Alloa.
This example is not in my possession.
The brick is stamped ‘Wilson’ to one side and ‘Stirling’ to the other.
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Below – The item is held in a collection owned by the Falkirk Community Trust and is described
Description – Iron frog stamp in the form of a lozenge containing the word “WILSON” in mirror image. Used by the Bonnybridge Silica and Fireclay Company Limited, (BSF) Bonnybridge.
Unfortunately, the reason why the association was made as described above is unknown but it is assumed that this stamp was recovered from the old BSF work site.
Following on from the above information it appears a Mr John Wilson was CEO/manager of the Bonnybridge Silica and Fire Clay Works, certainly between 1918 and 1922 and worked for the company for 40 years so he may well be the name stamped on these bricks and ‘Stirling’ represents the area of manufacture – Stirlingshire.
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.