Keith Murray Wedgwood Bowl in Black Basalt.
 
This 3813 shape bowl is 4 inches  tall and 6.5 inches in diameter and is in perfect condition with no damage whatsoever. Importantly with bowls like this, there is no water damage or oxidization on the inside of the bowl so the basalt is as prisine on the inside as it is on the outside.
 
This is a post-war bowl and while they used the KM roundel on the glazed pieces from this period, for some reason they didn't do the same for the basalt pieces so they just have the Wedgwood markings.