Photographed this partial brick in Sutton near Roughdales brickworks.
The A.P.Greens are firebricks made by the A.P. Green Fire Brick Co. Having researched this brick on the Scotlands Brick and Tile Manufacturing website. It appears to have a strange story about the brickmark?
AP Green in Missouri, USA bought the Douglas Fire Brick Company, Ayrshire Scotland from the Morgan Crucible Group in 1970. It appears that the brick may have been an import as the AP Green stamp was never used on bricks manufactured in Scotland.