9.25" diameter. Very old, antique flow blue plate with fabulous crazing and darkened spots from age. Love the back. There is damage on this plate with a large chip on the rim that has been blackened out, an inner rim repaired darkened mark in 2 spots of the inner rim and a tiny fleck chip on the rim. Some minor flecking of finish on the very exterior outer rim.  Gorgeous old, dating from 1845 to 1870. As is.