Royal Worcester was established in 1751 and is believed to be the oldest or second oldest remaining English porcelain brand still in existence today. He let his two sons run the concern, with John Flight taking the lead role till his death in 1791. In 1788 George III, following a visit to the company, granted it a prestigious royal warrant, the word'Royal' was added to the name. The standard printed factory mark, included the number 51 in the centre that refers to the year 1751 when the Worcester Porcelain Company was founded by Dr John Wall.
The mark can appear in any colour, and on a variety of materials.