I am not sure if the bowl on the left is a true Blue Willow Bowl. It is not stamped. I could not find any information on it. My mom has had these for years. Probably over 40 years old. I am not charging a high price because of not knowing.  The bowl on the left is a lighter color also.

The Blue Willow Soup Bowl set of two by Royal China features a classic blue and white pottery design in a round shape, perfect for all occasions. This vintage set from the mid-20th century showcases an Asian-inspired style with a glossy finish, adding a decorative touch to your table setting. Made of porcelain and ceramic, these stackable bowls are part of the Willow Blue product line, reflecting the Oriental theme and traditional Blue Willow pattern.