• Calder L 22

    Found Drum Farm, Bonnybridge. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder Firebrick

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  • Bonnybridge

    Found Drum Farm, Bonnybridge. Bonnybridge Silica & Fireclay Brickworks, Bonnybridge, Stirlingshire.

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  • Bonnybridge

    Found at Drum Farm, Bonnybridge, Falkirk Because of the shape of the frog,  this has more the appearance of

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  • Calder _

    Found Dalmellington This brick is crudely tapered. Note the thumb print to top right. Bonnybridge Silica

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  • Bonnybridge 14

    Found Barrhead, Glasgow. Bonnybridge Silica & Fireclay Brickworks, Bonnybridge, Stirlingshire. .

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  • Octo D764

    Found Firth of Clyde, Port Glasgow Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder

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  • Octo BL Supra

    Found Drum Farm, Bonnybridge OCTO BL Supra ( Bloating Ladle) Bonnybridge Silica & Fireclay Co Ltd,

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  • Bonnybridge 24A

    Found at Drum Farm, Bonnybridge. Bonnybridge Silica & Fireclay Brickworks, Bonnybridge, Stirlingshire.

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  • Calder 2825

    Found at Drum Farm, Bonnybridge Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder Firebrick

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  • Bonnybridge 43

    Found Drum Farm, Bonnybridge. Bonnybridge Silica & Fireclay Brickworks, Bonnybridge, Stirlingshire.

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  • Bonnybridge 25

    Found Drum Farm, Bonnybridge Bonnybridge Silica & Fireclay Brickworks, Bonnybridge, Stirlingshire.

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  • Calder 19S

    Found by Aimee Surprenant in a house built in 1875  in St. John’s NL, Canada. This example is

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  • Octo

    Found Barrhead, Glasgow Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder Firebrick Works,

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  • Bonnybridge 30

    Found Barrhead, Glasgow Bonnybridge Silica & Fireclay Brickworks, Bonnybridge, Stirlingshire. . .

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  • Octo 43

    Found by Graham Brooks – Solwaypast.co.uk Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge.

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  • Bonnybridge 15

    Found Barrhead, Glasgow Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder Firebrick

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  • Bonnybridge 18

    Found at Drum Farm, High Bonnybridge. Bonnybridge Silica & Fireclay Brickworks, Bonnybridge, Stirlingshire.

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  • Calder

    Found by SP in the Paisley area. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder Firebrick

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  • Bonnybridge

    Found Darnley, Glasgow. Bonnybridge Silica & Fireclay Brickworks, Bonnybridge, Stirlingshire. . .

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  • Calder L 25

    Found Darnley, Glasgow. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder Firebrick Works,

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  • Novo Super 70

    Found at Drum Farm, Bonnybridge. This brickmark is referred to in a Bonnybridge Silica & Fireclay

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  • NOVO 60A

    This brickmark is referred to in a Bonnybridge Silica & Fireclay Co Ltd brochure Bonnybridge Silica

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  • Octo M

    This brickmark is referred to in a Bonnybridge Silica & Fireclay Co Ltd brochure Bonnybridge Silica

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  • Calder LS

    This brickmark is referred to in a Bonnybridge Silica & Fireclay Co Ltd brochure Bonnybridge Silica

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  • Calder L

    Found Newmains, North Lanarkshire Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder

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  • N Sillimanite

    This brickmark is referred to in a Bonnybridge Silica & Fireclay Co Ltd brochure This may have also

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