Annotation Class 4. Proprietor The Worcester Royal Porcelain Company Limited. Worcester. 1/3 size plan. Full size side view. William Brookes, 62 Chancery Lane, London. Patent & Registration agent.
See Henry Sandon, Royal Worcester Porcelain from 1862 to the Present Day, (Clarkson N. Potter, Inc, New York, 1973, 1st American edn, 1975), page 171 which lists this design as Class 6 number 90 with the shape title 'Dagmar Horn'.