This example was found at the Bonnyside works

SDR – ‘D’ within a diamond motif. SDR  –  Super Duty or 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.

Below – The same stamp but on a very slight variation. Found at same location.


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