From what I have read it was added in the late 1920's but had to be removed due to the British laws for Royalty "By Appointment" stamps. They were not allowed to have "By Appointment and "Royal in the same stamp. I believe it was removed by 1934. This is not a reproduction backstamp. Cup Across the Top: 3 1/2 without handle.
This item is in the category "Collectibles\Kitchen & Home\Dinnerware & Serveware\Cups & Saucers". The seller is "hooked-on-vintage" and is located in this country: US.
This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.