1902 one-dollar coin, I don't know what it is, how much is it worth now? see
This design is the East India trade silver dollar issued by the British Empire in India, commonly known as "Zhanyang". All the ones with good appearance are around 550-600 yuan, but your one is dim in color and fuzzy in boundary, so I'm afraid it is probably a fake silver dollar. If it is a fake silver dollar, it is basically worthless.