We call this group "Perswaition" because the Fitzwilliam Museum has an example titled Perswaition in a little yellow tablet on the base. Think you want a titled example? I believe the Fitzwilliam's example may be the only one. You can see it on page 64 of my book, People, Passions, Pastimes, and Pleasures: Staffordshire Figures 1810-1835.
For a long time, collectors believed that Jane Austen's novel "Persuasion", published in 1818, inspired pearlware Perswaition groups. Instead, this glass picture bearing the title "Persuasion" and dated 1809, is clearly the figure's design source. So Perswaition can date to as early as 1809. Obviously dated design sources are invaluable in guiding the dating of our figures.