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Found by Gordon Wyle in the Clakmannanshire area.

1 HDR – ‘D’ within a diamond motif. HDR  –  Hard Dyson Refractory?

These Dyson bricks were made at the East Works at  Bonnybridge ( Dougall  / Dyson site)

James Dougall & Sons Ltd, Bonnybridge, Stirlingshire

Alternative brickworks include:

  • Bonnyside Brickworks, Bonnybridge, Stirlingshire.

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