Instructions
Buy a good reference book to help you look for specific markers on your pottery. Look at the base of the piece. If you see "Made in England," this means that the piece was manufactured in the twentieth century, probably after 1914. If you see "Ltd." or "Limited," this signifies that the piece was manufactured after 1880. You may also see a registration number. Registration of designs began in 1884. The registration number dates when the design was registered, but the piece may have been made after this.
Look for the name of the manufacturer, which may be on the base of the piece. This can be a key identifying feature, as it may be that the particular manufacturer was only making particular pieces during a limited time span. Look for a trademark. If this is present it indicates that the pottery or china piece was made after 1875. Any piece with "Royal Arms" is nineteenth century or later.
Check for the name of the pattern. This was only added after 1810. Bone china was made beginning in the twentieth century in Staffordshire. A simple quartered shield on the base indicates a piece dating after 1837. If there is an extra section in the center of the shield this dates the piece as prior to 1837.