While the 18th- and 19th-century examples of Wedgwood Jasperware are sought after, with rare exceptions, the 20th-century examples are not, which makes identifying when a piece was made of utmost importance.
The more modern versions can be quickly identified if you know what to look for.
There is evidence to be found in Wedgwood's correspondence that the usefulwares factory was still making basalt tea sets during the Wedgwood & Bentley period (1769-1780) and marking it with this mark.
Exceptional pieces of teaware with the mixed case mark could be from the W&B period.
This example has a few clues to its vintage: first, it’s stamped “Made In England,” “Wedgwood” and “57.” The marking “Made In England” automatically labels this as most likely a 20th-century example.
This mark belongs to the usefulwares factory before 1780.
Jasperware was originally developed by Josiah Wedgwood during the mid-1700s.
Jasperware is a very distinctive type of stoneware with ivory/marble-looking appliques of Greek and Roman classical design on a blue, black, pink, brown red or green background.
White ornamention was made in a mould, then attached to the coloured vases, tableware, portrait medallions etc.
This so-called “sprigging” technique was already familiar to potters of the time.
The colour was incorporated in the basic mix for solid jasper.
This formula was expensive to manufacture and Wedgwood soon developed an alternative – the jasper dip, or surface jasper.