Things You'll Need
Instructions
Look for the Registration Number on the jug. Under a strong light, turn the jug over carefully and look at the underside of the base. You may need to use a magnifying glass. Consult a guide to Royal Doulton marks and numbers; these can be found in books on Royal Doulton, or on antique porcelain websites.
Learn about what the Registration Number means. It will not give you the actual date that the jug was manufactured; it indicates the date that the design of the jug was registered. Some Toby jugs were made prior to the design's registration. These jugs will have the phrase "Registration Applied For" in lieu of the RN.
Estimate the date that the Toby jug was made. Registration Numbers were used by Royal Doulton starting in the 1930s. In the 1940s and 1950s, the company began to register its designs in a greater number of export regions. After 1947, the jugs were marked with a copyright date. In the same year, four special regional RNs were created for Great Britain, South Africa, Australia and New Zealand. The Registration Number was no longer used on Toby jugs by the 1960s.
Look for a number in the upper right hand corner of the underside of the jug. Royal Doulton stamped a number there which, when added to the number 1927, will give you the date the piece was made. This number was stamped on the Toby jugs from the year 1927 on.