This is a double maker mark that does not appear to be in Grimwade or online. It is from a goblet created in London in 1829. AA over WS in a square with clipped corners. https://photos.google.com/share/AF1QipNRnDEgePbq7kU2wIzIjmMqD8wKyu1Kj3__MChRQ2nTpSR9VTDtf_E7rLukQh-u3Q/photo/AF1QipPif7D_P6TmkdUQB...