Fig. 2. Gilt brass floral-and-torus bail, circa 1770.
Almost exclusively, Chippendale also fitted much of this more sober furniture with back spring locks that had unique S-shaped keyholes (Fig. 3), keys (fig. 4) and commensurate S-shaped escutcheons (figs. 5 & 6).
Fig. 3. S-shaped keyhole in iron lock case, circa 1770.
Fig. 4. S-shaped iron key, circa 1770.
Fig. 5. Chippendale S-shaped brass escutcheon, circa 1770.
The intriguing asymmetry of the S-shaped brass escutcheon would have been Chippendale’s primary objective, though the encumbrance would also have minimally increased the level of security of the lock.
John Cobb (a contemporary of Thomas Chippendale) is also known to have employed S-shaped escutcheons which may (or may not) account for the example in figure 6.
Fig. 6. Reverse S-shaped brass escutcheon, circa 1770.
 GILBERT, Christopher, The Life and Work of Thomas Chippendale, Tabard Press, 1978, p. 146.