The button appears to be a Victorian era 1-piece stamped-brass "cutout" picture-button. To me, it shows a scene of Courtship in China during that era. The figure on the left of the scene is a man, having a Chinese-style narrow beard, hat, Chinese man's hat, and Chinese man's pigtail. His hand, which is palm-downward, appears to be placing something in the woman's hand, which is palm-upward, and cupped to receive the gift. Note also, she is leaning outward toward him, from her low-walled porch, as her other hand clings to one of the porch roof's columns. To me, it looks like a male-comes-a'courtin' scene.