Please help identify my late mother-in-laws pieces

Hello all,


I am writing because we have three pieces that belonged to my late mother & father in law. They are really beautiful in my opinion, but we have no ideas about their history.

They were found in their home in Kansas. It is a collection of three pieces all with the same three pointy ovals intersecting in a triangular stamp pattern. They are stamped in different locations, some on the side, while the smallest bowl it is on the bottom. I have tried to load more pictures but it won't let me. The pitcher has some decoration in the work. Please let me know what else you need. I don't have the pieces to weigh them, but they are heavy. 

Thank you in advance.