Vintage Nikko Soup Bowls Made in Japan

Vintage Nikko soup bowls but could also be used as cereal or salad bowls. These were my Aunt’s and she did use them. I’m helping her sell items like clothing, jewelry, dishes etc. The one bowl does have crazing in a swirl pattern and the other one just has one spot where the crazing is. There’s no cracks or chips. She thinks they are from 1979. Please feel free to ask any questions. 6 1/4” diameter 1 3/4” tall