Fine Antique English Porcelain has dated these Regency Worcester Porcelain Plates to the Regency era.
Impressed and printed marks, referring to Coventry Street address.

It is interesting to compare the technique and composition of the shell painting with a very similar panel on a large vase attributed to John Barker in the Ewers-Tyne Collection of Worcester Porcelain at Cheekwood, see John Sandon (2008), pp 119-121. John Sandon quotes Solomon Cole from his memoirs who told William Chaffers that the artist John Barker excelled in painting shells

Literature: A pair of plates, probably from the same service are illustrated on page 90, plate 78, of Henry Sandon's 1978 book on Flight and Barr Worcester Porcelain.
Condition: Good with no damage or restoration just some fine surface scratches.
Fine Antique English Porcelain has dated these Regency Worcester Porcelain Plates to the Regency era.
Jonathan purt is a specialist in fine antique english porcelain
You can view the stock and full dealer information on the Fine Antique English Porcelain Profile Page