Masons Blue and White Pots de Creme Cup

This wonderful old pot de creme cup was made by Mason's Patent Ironstone, in the " Blue Pheasents " pattern is in excellent condition. The mark on the back reads Patent Ironstone China inside a banner under the Masons crown, The word Mason's has been omitted, acording to Geoffrey A Godden this mark is rare and only found on pieces dating from 1813 - 1820 ( Goddens Guide To Mason's China and the Ironston