"Kaiyuan Tongbao" ancient coin

Kaiyuan Tongbao is the Tang Dynasty currency. The coins began to have "Tongbao" in the Tang Dynasty. At the beginning of the Tang Dynasty, the five baht was used, and it was a little confusing. In the four years of Tang Gaozu Wuder (AD 621), it was a coin system for rectification, abolishing Sui Money, and imitating the strict norms of the Western Han Dynasty's five baht.
The initial "Kaiyuan Tongbao" was inscribed by the calligrapher Ouyang Xun. The shape was still used to use Qin Fang Kong's round money. Four or two.
In terms of quality, Kaiyuan Tongbao has one money for each article, one or two in each ten, each of which weighs six pounds and four pounds. Each article weighs two baht and four wires, and the quality is about 4 grams. In terms of style, the Early Tang Dynasty Kaiyuan Tongbao Baoguang has nothing to do with the money, and the back of the Mid -Tang Dynasty has stars, months, and other decorations. After more than 300 years of casting, the version is complicated. After the Tang Dynasty, there were still smelting, but most of them were different from Tang. In terms of specifications, Kaiyuan Tongbao is basically Xiaoping's money, but the Tang Dynasty also cast a small amount of "Kaiyuan Tongbao" for ten money, which is commemorative in Kaishi, and the descendants are also forged.

In the Tang Dynasty Kaiyuan Tongbao Xiaopingpu, the current existence is very large, and the market price is around 2 yuan. In the middle of the Tang Dynasty, the Yuan Tongbao is the type of the word on the back. The market price of the ordinary variety is about 10 yuan, and the special scarce version is high.
The picture of your currency is very vague and there is no back picture. It is difficult to judge which one is. Personally, it feels like a general product.

The back of the back has 2 million nail marks, if it is not only worth 200 yuan.