Crown Ducal is a line of porcelain produced by A.G. Richardson Co. Ltd. of England.  The company was founded in 1915 and discontinued operations in 1974 when it was sold to Wedgewood.  The "Gwynneth" pattern came into production in the 1920s under the "Florentine" line of dishware.  These are a set of 4 large rim soup bowls, with only one tiny chip on the edge of one of them (as shown in photos) and some slight crazing.