Japan sea blue ceramic tray handles s n p sugar spoon stamped

Vintage sea blue tray, Has petite handles on each end. Porcelain? Maybe. I don't know what it is made from. Then we have a salt shaker and a pepper shaker. One of them has a cork. The other one does not. The last container is slightly larger than the others. Looks like it should have a lid. But this one does not have the lid. It does however, have the spoon. The tray is stamped. The s n p shakers are stamped. The larger container is stamped. Made in Japan. This set is perfect. No chips, cracks or flaws. The scene on the containers is a tranquil pink yellow blue and soft green in color.