This is a very striking plate in it's pattern and proportions. Marked J. Clementson, Ironstone, Siam, the registered diamond mark is from the mid 19th century. It is also stamped with a 5. The size is just a little over 9 inches and is about 1 inch deep. The medium blue pattern in the background is feathery in detail and the scenery is very Indian or Persian in style. The condition is amazing for it's age. There is hardly any utensil wear and I only see two tiny spots of discoloration; one on the edge and one just above the big tree in the middle pictorial. It would be a lovely piece to display or to use on your dining table.