Thanks to Sallybear for the location info, armed with which I popped along and collected all the good bricks before Coalboard could get at them.
No need to panic Al, I actually only brought one home and that was something you already have. This is an interesting place with a selection of bricks mainly from North Wales. A small selection of the delights to be found is set out below.
A product of the Wrexham Brick & Tile Co, Kings Mills Brickworks, Wrexham.
Clarke & Rea, Wilderness Brickworks, Gresford.
'Industria Britannica'. Adamantine was one of the trade names used by Charles Davison & Co, Ewloe Barn Brickworks, Buckley.
Obsidianite was another of the trade names used by Charles Davison & Co, Ewloe Barn Brickworks, Buckley. One of their catalogues states:
"Read what a prominent American chemical engineer says. There appears to be in the USA no product equivalent to Obsidianite manufactured by Charles Davison Co of Buckley, England (sic). The Adamantine quality can be used for chimney and flue building, and is of particular value in withstanding the action of acid laden gases. It is admirable for all kinds of foundation work, manhole linings and culverts. For places where wet conditions exist, Adamantine material is eminently suitable."
The one that came home with me. Complete examples are very rare and Coalboard is the only person who has one of those. E Johnson, Swan Lane Colly, Hindley