Korean or Japanese? Recognize the mark?

My grandmother received this set of dishes as a gift from her nephew. We believe he was stationed in Korea in the early 1950's. He purchased them while on tour of duty. They came out of the china cabinet a handful of times for special family gatherings and both my grandmother and my mother treasured them.

We have not been successful in our search to find this mark and are curious about them. Any help would be greatly appreciated. :)