• Octo 10001 K

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

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  • Octo

    Found by Eddie McLean in the Glasgow area. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt

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  • Octo 7774

    Found at Inverkeithing. Octo 7774 – it may be stamped 17774 but I think the ‘1’ is

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  • Calder

    Found Manuel Works, Whitecross by Gordon Wyle. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge.

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  • CXL G

    Found Manuel Works, Whitecross by Hazel Wyle. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge.

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  • Calder 1/2

    Found at the old Ravenscraig Steel Works, Motherwell. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge.

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  • Octo 3 1/2

    Found at the old Ravenscraig Steel Works, Motherwell. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge.

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  • Calder 22

    Found at the old Ravenscraig Steel Works, Motherwell. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge.

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  • Octo 41

    Found at the old Ravenscraig Steel Works, Motherwell. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge.

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  • Octo –

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

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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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  • Octo

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

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  • Octo 43

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

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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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  • O C 4 24

    Found at Stein Castlecary Works, Bonnybridge. Unidentified maker. Find origins would suggest Scottish

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  • Octo F

    Found Banknock – could be Octo E Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder

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  • CXL

    Found Manuel Works, Whitecross Calder Firebrick Works, Airdrie, Lanarkshire. Bonnybridge Silica &

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  • OCTO 2222 12 6

    Found Granton, Firth of Forth. Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder Firebrick

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  • Octo

    Found Manuel Works, Whitecross Bonnybridge Silica & Fireclay Co Ltd, Bonnybridge. alt Calder Firebrick

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