Found Manuel Works, Whitecross J G Stein product. Stein, Castlecary Fireclay Works, Castlecary, Stirlingshire. Stein, Manuel Firebrick and Refractory Works, Whitecross, Stirlingshire. Stein & Co, Anchor Brickworks, Denny, Stirlingshire. Milnquarter Fireclay & Gannister Works, Bonnybridge, Stirlingshire. Refractory blocks through which air is blown and heated prior to being used in the blast furnace. Info from…
Found near Morpeth, Northumbria by BW
Unidentified maker but I do believe that the bauxitic clay will have been mined by the Ayrshire Bauxitic Clay Company. The best quality of this clay was sent to a subsidiary, namely Henry Foster at the Hotspur brickworks in Backworth near Newcastle.
The find location would suggest this may be a brick manufactured with Scottish clay at the Hotspur Works, Northumbria, England.