Japanese Rice/Soy Bowls Set of 5

Vintage Japanese Rice/soy bowls set of 5 Set is in original packaging, USED Purchased as a gift over 20 years ago. Does not have a company name listed on the box. Made in Japan. These are more like stoneware than glassware. Various colors-blue, green, etc. In good shape. There are some minor imperfections (pictured)- spotting to the stone/pottery, what appears to be cracking in the color, but is not on the surface. Top glazing is fine. No actual cracks in the structure of the bowls.