From 1877 the year number was dropped in favour of the letter system which carried on the same sequence.
In 1890 the capital letter changed to a small letter and started again but the sequence was only to last for one year.
The Royal Worcester standard printed factory mark includes the number 51 in the centre which refers to the year 1751 when the Worcester Porcelain Company was founded by Dr. Early standard marks show the crown slightly above or perched on the circle and from 1876 the crown sits down onto the circle. In 1862 with the restructuring of the Royal Worcester company and the introduction of a new factory mark came the first of the new Worcester date coding sequences.
From 1862 until 1867 the last two numbers of the year would be used.
In January 1989 new factory stamps were phased in with N in place of the M and soon afterward black numbers were introduced.In the late 1700s Worcester were among the first to use the Bute shape for teabowls, tea cups and coffee cups.The presence of the crescent mark dates these items to the Dr Wall period and they are all very similar in shape, size and decoration to those made in the same period by Caughley.Rather than use names the Worcester factory relied on pattern numbers which were hand written in script, rather than stamped.Records of Worcester tableware marks were only published for the more expensive hand painted patterns which appeared randomly throughout the numbering sequence.
It being easier and cheaper to put an extra dot on existing copper plates than make new ones.