We Just Found Our First WARCO Fire Brick Do you see what I see? We were walking through a pile of fire brick when this one jumped out WARCO stamped clean and clear. Even crazier, the marking shows up in the mortar impression too, which is something you don’t see every day. This is a WARCO fire brick, likely dating to the 1930s–1940s, and it’s our first one ever. Fire bricks like this were built to handle extreme heat, and finding one this clean is rare on its own let alone a new maker for the co