American Atelier At Home ironstone china cake stand or compote in the Athena pattern.
This is actually more like a white earthenware ceramic than ironstone (at least, than vintage ironstone). But it has a lovely embossed pattern in the style of old creamware, and would mix well with other patterns old and new.
It's 11" across the rim of the plate, and 7" across the bottom. It's in very good condition without damage, barely used.