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The following two diamond shaped marks were used from 1842-1883:

Mark I: Used from 1842-1867

Each letter on the diagram represents one of the tables below:

D.-Day of the Month

E.-Bundle Number

Exceptions:

In 1857 the letter R was used during 1-19 of September, during 1860 the letter K was used for December.

To give an example using the mark above the chart, you get the following information: Material-Ceramics, Design registered-April 7, 1857.

The Bundle number is unimportant to most collectors.

Mark II: Used from 1868-1883

Each letter on the diagram represents one of the tables below:

D.-Day of the Month

E.-Bundle Number

Exceptions:

1st-6th of March 1878, W was used for the year instead of D, and G was used for the month in place of W.

To give an example using the mark above the chart, you get the following information: Material-Ceramics, Design registered-August 9, 1870.

The Bundle number is unimportant to most collectors.

English Registry Numbers:

After 1883 a Numerical mark was used in the following form:

Rd 742833 or Rd No. 742833