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How to date English porcelain

To trace the exact date (year, month and day on which the registration was made) of an
English object of any kind (glass, metal, porcelain, wood, ceramics, sheffield or furniture) it is necessary to look to see whether the object has an engraved mark: Diamond or Lozenge.
The period of time in which the Diamond mark was used, from 1842 to 1883, is divided into the first and second periods. The marks are identical, recognisable only by the position of the numbers and letters.

First period from 1842 to 1867
Second period from 1868 to 1883

To work out which period it belongs to, one has to look at the lozenge: if at the lower tip it has a number
(at point E we see the number 9) it is from the first period 1842/1867. If instead in the lower tip
If, on the other hand, you find a letter at the lower tip (at point C we see the letter R), it is from the second period 1868/1883.

The letter A indicates the material, the letter B the year, the letter C the month, letter D indicates the day of the month.
Letter E is the Bundle number: irrelevant for collectors.

1ST PERIOD 2ND PERIOD

Tables
Reference tables

DIAMOND OR DIAMOND MARK
After 1 January 1884, all models registered after that date instead of the Diamond was assigned a sequential number (see table with registration numbers from 1884 to 1965).

The number is usually after the words Rd. No. or reg. No. ....
Curiosities