context: One of the rarest items in the collection is the 58 cm high Gloucester Candlestick, dated to c1110, made from gilt bronze; with highly elaborate and intricate intertwining branches containing small figures and inscriptions, it is a tour de force of bronze casting. Also of importance is the Becket Casket dated c1180 to contain relics of St Thomas Becket, made from gilt copper, with enamelled scenes of the saint's martyrdom. Another highlight is the 1351 Reichenau Crozier. The Burghley Nef, a salt-cellar, French, dated 1527–28, uses a nautilus shell to form the hull of a vessel, which rests on the tail of a parcelgilt mermaid, who rests on a hexagonal gilt plinth on six claw-and-ball feet. Both masts have main and top-sails, and battlemented fighting-tops are made from gold. These items are displayed in the new Medieval & Renaissance galleries.
question: Which object mentioned in the passage is nautically themed?