A superb Derby porcelain plate with the coronet of a Viscount and initial D. From the date of the plate, the Viscount could be:

Viscount DONERAILE of Ireland (St Ledger family)
Viscount Dillon of Ireland 
Viscount Dawnay (2nd Creation)

Measurements: 9.5 Inches wide.
Condition: Perfect, typical fine crazing.