This plaque of Queen Victoria is a fairly scarce item. The back stamp carries the Royal Warrant " Manafacturer's To HRH Prince Albert. This warant was granted to the Pratt factory at the 1851 World Exhibition held at Crystal Palace London. The Pratt's recieved a gold medal for their display and was given a Most Honourable Award. Prince Albert was the Patron and the driving force behind the Great Exhibition and it was aclaimed to be the greatest exhibition every held in the world. Prince Albert died in Dec 1861 and the Pratt factory could no longer mark their wares with the Royal Warant. The Pratt factory were producing these plaques prior to the Prince Alberts death. With the plaques they had in stock they coloured the background and refired them. The plaques were then called a mourning plaque.