Unidentified Stamp

Unidentified Stamp
Monogram: E B B
Initial: E B B
Coronet: Duke
There is a couple of possibilities in identifying this stamp: it is probably Elizabeth (Bosawen), Duchess of Beaufort (1747-1828), wife of Henry Somerset, 5th Duke of Beaufort; or Elizabeth (Brudenell), Duchess of Buccleuch and Queensberry (1743-1827), wife of Henry Scott, 3rd Duke of Buccleuch and Queensberry.