The production of Derby porcelain dates from the second half of the 18th century, although the authorship and the exact start of the production remains today as a matter of conjecture. The oldest remaining pieces in the late 19th century bore only the words "Darby" and "Darbishire" and the years 1751-2-3 as proof of place and year of manufacture. More important is the fact that the production of porcelain in Derby predates the commencement of the works of William Duesbury, started in 1756 when he joined Andrew Planche and John Heath to create the Nottingham Road factory, which later became the Royal Crown Derby.。