Found by Eddie McLean in Glasgow
Find location would suggest Scottish origins but….
The 2 most likely Scottish makers are
Bonnybridge Silica and Fireclay Co Ltd, Bonnybridge
and the
Eglinton Silica Brick Co. Ltd, Dundyvan, Coatbridge
However I have discovered this reference which is also a possibility however I am sure many companies will have stamped their bricks silica.
1951 – OUGHTIBRIDGE SILICA FIREBRICK CO. LTD., OUGHTIBRIDGE, NR. SHEFFlELD. T.A., “Silica, Phone, Oughtibridge”. T.N., Oughtibridge 40804. Established 1856; Incorporated 1918.
Silica bricks and cement; Serpex (magnesium silicate) bricks; magnesite cement ; silica, magnesite, chrome-magnesite, chrome bricks and cements; parging cements; ground ganister; etc.
Trade Names: Silica; S.P. Silica; Serpex.
Managing Director: S . Brooke.
Below – this similar mark was found in Fife by JC. Note the thumb print to top right.
Found at the old Glenboig Union Fireclay Works site. It could read Gartcosh or Gartcraig but because of the find site, I will assume it says Gartcosh. Sil probably reads Silica. Gartcosh Silica? Gartcosh Fireclay Works, Gartcosh, Glasgow. .
