1. Why use this guide?

Simply stated, employ a production date calculated by adding three years to the registration date. I consider this appropriately conservative. Of course if a production run is historically known to have endured for less or more than six years, then the assigned production date should be accordingly adjusted.

While different research questions will beg varying levels of precision, as long as the reader is informed of the date range, its rationale, and the attendant median value employed, one is probably on safe ground. Archaeologists can therefore be provided with a meaningful form of temporal data. The literature on registry marks and numbers has remained somewhat remote and contradictory. What we hope to provide here is a concise and accurate summary of the codes and dates.

As previously indicated, the marks were impressed Figure 1 , printed Figures 2 and 3 , or, less commonly, embossed. Often times it is difficult to read the small numbers and letters of the impressed forms. If such is the case, we recommend a color scanning at dpi and then bringing the resulting TIFF image into a program like Photoshop in order to manipulate color.

Registered Design Numbers

In the Figure 1 illustration all that was done to produce the false color image was an adjustment to gamma. The obscure "3" of the day of the month indicator became immensely more legible as a result. Impressed early diamond design registry mark.


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Printed early diamond design registry mark. Printed late diamond design registry mark.

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The following information is adapted from the United Kingdom's National Archives' research guide entitled "Registered Designs: Diamond Marks During the period to the British Patent Office issued a diamond mark along with the registration number when a design was registered see the research guide Registered Designs and Trade Marks for details of registration. The mark identifies the type or class of material see Table 1 for class codes ; the number of items included referred to as bundles or packages ; and the year, month, and day of registration.

What follows below is a description of the marks and the information necessary to decode them. Note that the registration number does not form part of the mark.

British Registered Design numbers (1842 to 1944)

The center is filled by the abbreviation "Rd" which signifies that the item is a formally patented or R egistered D esign. The location of the four pieces of information year, month, day, and number of items in the bundle contained within the diamond changed in Take a close look at the illustrations in Figure 4 to observe the changed locations. The year code also changed at this time. In determining the registration date for a particular item, the day will be stamped as an Arabic number, the month code can be found in Table 2, and the year codes can be found in Tables 3, 4, and 5.

Dating English Registry Marks 2. Great Glass maintains an excellent web for dating items recorded in the British registry.

Registered Designs

He identifies and describes the work of over potters. It is a great site for the identifcation of anything Staffordshire.


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  • Registered Numbers (Reg. No.) Age Dating 1884 - 1965!
  • Registered Design Numbers!
  • The link to the registry design page is: Registered Marks and Numbers Beginning in , with the initiation of the Copyright of Designs Act of , the diamond mark was replaced by the use of the registered design number printed as a line of script Figure 5. It was therefore like a cross between a patent and a copyright. Many designs were registered by the manufacturers or retailers rather than the designers, so it is not often possible to identify designers on the basis of Registered Design numbers alone.

    The letter at the top corner identifies the year.

    This system ran until , when it was replaced by a series of sequential numbers preceded by Rd, which can be banded into years for dating purposes. For example, Rd dates a design to For most years there are overlaps in the sequences of numbers.