Grandmother's Art Pottery Bowl--Holland?

This bowl has always been one of my favorites. It is very delicate; very thin. It is cracked almost in half but has stayed together all these years. The colors are so beautiful and vivid, almost like a peacock. I've never been able to identify the marks. Anybody have any ideas? I don't know about age, either, because a lot of my maternal grandmother's things were actually my great-grandmother's.

The last picture is sort of my little "shrine" to my relatives and their collectibles that have spurred my own interest in collecting. The table everything is sitting on is my paternal grandmother's. The mosaic in the background, however, is a recent thrift store find.