This is a good Mason’s ironstone large dinner plate produced at the time when Mason's was owned and controlled by George L Ashworth and Brothers after the bankruptcy of C J Mason in 1848.
This large plate is decorated in a the striking chinoiserie pattern called "Flying Bird" pattern, as illustrated on Page 121 of "A Guide to Mason's Patent Ironstone Patterns" published by The Mason's Collectors' Club. The pattern would have been transfer printed then boldly hand enameled with good detail. The plate also has a mid-brown / ochre hand painted outer rim simulating the Chinese plates of the time and earlier periods.
The base carries a blue transfer printed mark Ashworth Brothers, Hanley mark with England below and some impressed marks, dating this piece to circa 1900 or very early in the 20th century.
 
DIMENSIONS
Diameter
10.55 in
Height
1.13 in