Bai Jin San Pin 白金三品
Baijin Sanpin is a set of three types of coins: Dragon, Horse and Turtle issued in the Han dynasty 119 BCE.
"Bai Jin" refers to the metal, lead, "San Pin" refers to the fact that it was a series of three coins with different denominations. Dragon, Horse and Turtle.
The Dragon Coin:
The obverse image is a dragon.
The large images of the Dragon coin and the clay imitation are my own, the other images are not.