Dating black wedgwood
It does look like an early example and black coloured Jasperware is one of the earliest of the Wedgwood Colors.
It may be of some value to somebody I just need to find that somebody.
Today the complete production of Wedgwood jewellery takes place in Stoke-on-Trent, the centre of the English ceramic industry.
SIL in stamped on the back of the Silver frame encasing the cameo. Some 20th century Wedgwood Jasper Cameos are marked with the year of production. 1951"64" rs could be a serial number or an early registry month or year number.You can work out the date of your wedgwood cameo by it's color. Many Antique Cameo owe their appearance to the inspiration of the most famous "Roman Portland Vase" which was a source of inspiration for Josiah Wedgwood in the 18th Century to create his original jasper stoneware.