How to Identify the Chinese Cash Coin (Qing Dynasty 'Kangxi Tongbao')

What This Coin Is

The Kangxi Tongbao cash coin was cast during the reign of the Kangxi Emperor, one of the longest and most stable reigns of China's Qing dynasty, spanning the late seventeenth into the early eighteenth century. Cash coins of this general round-with-square-hole design had been used in China for many centuries, and Kangxi-era pieces are among the most commonly encountered historical Chinese coins today due to the long reign and widespread production.

Obverse Design

The obverse carries four Chinese characters arranged around the central square hole, read in the traditional top-bottom-right-left order: "Kang Xi Tong Bao" (康熙通寶), meaning roughly "circulating treasure of the Kangxi era." The calligraphy style of these characters can vary somewhat between different casting locations.

Reverse Design

The reverse is typically plain or carries one or two small characters, often in Manchu script (the language of the ruling Qing dynasty), positioned to the left and right of the square hole, identifying the specific provincial mint that cast the coin.

Size, Weight, Metal, and Edge

Kangxi cash coins are cast in bronze or brass, are relatively thin and lightweight compared to modern coinage, and have a plain, unmilled edge consistent with the traditional Chinese casting method used for cash coins over many centuries.

Mint Marks and Where to Find Them

The Manchu characters on the reverse function as the mint identifier, denoting the specific provincial mint (such as those known by Manchu names like Boo-Chiowan or Boo-Yuwan) responsible for casting that particular coin; comparing these small reverse characters against a reference chart is the standard way to identify the exact mint.

Telling It Apart from Similar Coins

Kangxi Tongbao coins are easily confused with cash coins from other Qing emperors' reigns (such as Shunzhi, Yongzheng, or Qianlong), which share the same general round-with-square-hole format but carry different reign-name characters on the obverse. Careful reading of the four obverse characters is the reliable way to identify the specific reign.

Grading at a Glance

Because these coins were cast rather than struck, even high-grade examples show the somewhat soft, rounded character edges typical of casting rather than the crisp lines of a struck coin; grading instead focuses on how clear and legible the characters remain, the coin's overall surface condition, and whether the square hole and rim are intact and well-formed.

Authenticity Red Flags

Given how commonly these coins were produced and how many genuine examples survive, most are inexpensive, but modern reproductions and later-cast "fantasy" pieces exist; warning signs include characters that look too crisp or stylistically modern for a traditional cast coin, an unnaturally smooth or shiny surface lacking honest handling wear, and incorrect Manchu reverse characters that don't match any known genuine mint combination.