What was the unicorn tail of the dragon turtle in Kangxi period of Qing Dynasty?

It is an auspicious animal, the dragon-headed turtle (North God: Xuanwu), which can ward off evil spirits and keep peace.

Dragon turtle (the god of the north: Xuanwu) is the treasure of the town house. During the Kangxi period of the Qing Dynasty, it was manufactured with the technology of products and feeders. Specification: 123 width *2 16 length * 166 height (mm) unicorn-tailed dragon-headed turtle, with two small turtles and a small dragon-headed turtle on the back, a gold ingot and a large copper coin, with auspicious Chinese characters "good luck" on the copper coin and gold ingot and copper coins on the front.