Royal Plate on show in London: Historic Exhibits From Buckingham Palace and Windsor Castle. This gilt sauce-boat (one of a pair from a set of four) is also a Nicholas Sprimont from the Frederick Prince of Wales service. The shell shapes are supported on large dolphins with seated figure of Venus and, as here, Adonis. Nine inches high, the sauce-boats were made in 1743 and 1744. July 28, 1954.