Dating wedgewood jasperware
The more modern versions can be quickly identified if you know what to look for.
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.
Most of the designs were carefully sculpted copies of classical Roman or Greek ceramics – pottery in “antique form” as it was called then.
They are distinctly separate marks, and generally appear over or under the mark.
This appears to be a potter's mark, and belongs to the period 1795-1850; perhaps a little later.
It is white by nature but stained with metallic oxide colors; its most common shade in commerce is pale blue, but dark blue, lilac, sage green, black, and yellow are also used, with sage green due to chromium oxide, blue to cobalt oxide, and lilac to manganese oxide, with yellow probably coming from a salt of antimony, and black from iron oxide.
The earliest jasper was stained throughout and was known as "solid," but by 1829 production in jasper had virtually ceased.Jasperware’s popularity has had its ups and downs, but has never really been out of production since its invention.