According to a slip cover to the morocco leather presentation case the subjects are Viscountess Curzon, Lord Frederick Campbell and Lady Frederick Campbell.
Scottish nobleman and politician Lord Frederick Campbell (1729-1816) was the second husband of Mary Shirley, Countess Ferrers (c.1730-1807), the youngest daughter of Amos Meredith and Joanna Cholmondeley. Her sister Anna-Margaretta became Viscountess Curzon when Tory politician Assheton Curzon, 1st Viscount Curzon took her as his third wife.
These fine examples of glyphic art from around the turn of the 19th century were perhaps made as a keepsake for one of the three subjects or a close family member. Each was initialled ‘WB' for an unidentifed gem cutter whose initials appear on a number of pieces from this period.
Guided at £400-600 at the auction on August 2, the trio sold at £7100.