Nicholson Calvert (1764-1841) *watercolour on ivory *12.7 cm high *inscribed verso: Mr Nicolson Calvert/ of Hundson House/ Hertfordshire, Furneaux/ Pelham Hall, and/ Chilerley Cambridgeshire/ son of Felix Calvert/ & Elizabeth, daughter/ of Sir Robert Ladbroke/ M.P. Lord Mayor/ of London./ Married Jan 9th/ 1789. the Honble/ Frances Pery/ Painted by/ ?.