No, this is not an egg from which will hatch a Button-Spotted Gosling.
What it is, is a goose egg, several years old, completely dried inside. I have drawn buttons all over it with my colored pencils, in a pattern that is reminiscent of a real spotted egg of some kind. I must admit that my child-like imagination kicked in while I was working on this, and now there's a little story in my head that includes a mysterious hatchling with button-eyes!
3.5" x 2.5" x 2.5", colored pencil and acrylic medium on goose egg