Pretty Blue White Asian Floral Pattern Porcelain Dish

This is a pretty little porcelain plate with Asian letters on the back. I don't know if it is Chinese or Japanese. It looks like hand painted chintz. It is in excellent condition, no chips and no cracks. It measures 4 and 7/8 inches across, so it is probably a sushi or condiment dish. I don't know the age or maker, it is an auction item.