From above: Starting in 1842, England offered registration of its decorative designs for metal, pottery, china, wood, paper, pottery, china, porcelain, glass and more. By using the information below, and in the above link, you can find the date a design was registered. Not every piece registered was marked. Remember this date is just when the design was registered. An item with a registry mark or number could have been produced before (less likely as the design would not be protected), or after the date of the registry mark.
Some bells made in the UK may have these marks. Sterling Silver items have their own marks.
Diamond shaped marks were used from 1842-1883:
Mark I: Used from 1842-1867 – Mark II: Used from 1868-1883
A. – Materials (Roman numerals: Metal = I, Wood = II, Glass = III, Ceramics = IV, …)
B. – Year (Capital letter)
C. – Month (Capital letter)
D. – Day of the Month (Numeric)
E. – Bundle or Parcel Number (Generally unimportant)
After 1883 a Numerical mark was used in the following form: Rd 742833 or Rd No. 742833
The starting number for each year can be found in the reference link above.