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Warring States period
Yu Yi Jin
State of Wei
戰國時期
虞一釿
魏國造
Item number: A2800
Year: 475-271 BC
Material: Bronze
Size: 56.9 x 39.2 x 1.8 mm
Weight: 16.5 g
Provenance: Fuchin Coin 2020
This is a spade coin (bu bi) dating to the early or middle Warring States period, circulated primarily in the territories of the Three Jins and the Two Zhaos, corresponding to present-day Henan and Shanxi provinces. The coin belongs to the category of medium-sized flat-handled spade coins and carries a nominal value of one jin.
Its form features a flat head, rounded shoulders, arched hollow (bridge-like legs), square feet, and a straight waist. The shoulders and legs flare outward, giving the coin a trapezoidal shape, with a raised border along the edge. The obverse bears the inscription “Yu yi jin” (虞一釿) in large seal script, written both in mirror-image and reversed script. The character “Yu” may alternatively be interpreted as “Wei”, “Li”, or “Shan”. The character “jin” is composed of reversed components for “metal” (金) and “axe” (斤). The reverse of the coin is flat, plain, and uninscribed, with no raised border.
The term jin in antiquity was synonymous with jin (斤), originally serving as a unit of weight. Over time, jin and jin diverged into separate systems. The jin mentioned in the inscription is associated with the same system as yi (鎰), with one yi possibly equivalent to ten jin. The standard jin, by contrast, belongs to the system of zhu (銖) and liang (兩), in which one jin equals sixteen liang, and one liang equals twenty-four zhu. According to inscriptions on the Ding of Lord Ping’an of Miyang, one jin is estimated to be equivalent to approximately 25 to 38 grams in modern weight. During the Warring States period, one standard jin was generally considered to be around 250 grams. Actual measurements of coins bearing the denomination jin suggest that those from the early Warring States period weighed approximately 30 grams, but declined steadily thereafter, with some coins from the late period weighing as little as 10 grams.
The state of Yu was a vassal state during the Zhou dynasty. Archaeological remains attributed to Yu have been unearthed at Gucheng Village, Zhangdian Town, Pinglu County, Yuncheng City, Shanxi Province. The ancient capitals of Shun (Puban), Yu (Yangcheng), and several capitals of the Xia dynasty are also believed to have been located within Yuncheng. During the Spring and Autumn period, the region belonged to Jin. After the partition of Jin among Han, Zhao, and Wei, the area came under Wei’s control. The town of Shanyì, located in present-day Shanzhou District, Sanmenxia City, Henan Province, was under the jurisdiction of the state of Guo during the Spring and Autumn period, later incorporated into Jin, and subsequently divided among Han, Wei, and Qin after the partition. In the first year of Duke Xiao of Qin (361 BC), Qin forces besieged Shanyì, then under Wei’s control. In the first year of King Huiwen of Qin (324 BC), Zhang Yi seized it for Qin and fortified it as Shang Commandery.
During the Warring States period, Wei was among the earliest states to rise to prominence through systemic reform. Following the partition of Jin in 403 BC, Marquis Wen of Wei employed Li Kui to implement reforms inspired by Legalist thought, establishing military merit-based ranks and centralised administration, thereby enabling Wei to assert dominance over the Central Plains. However, excessive external expansion caused strategic overreach, and military defeats—particularly on the western front against Qin—led to the loss of the Hexi region. Following its defeat by Qi at the Battle of Maling in 341 BC, Wei’s national strength declined, and it subsequently aligned itself with the anti-Qin he zong (vertical alliance). Ultimately, in 225 BC, General Wang Ben of Qin diverted the Yellow River to flood Daliang (modern-day Kaifeng), leading to the fall of Wei.
Spade coins were a type of shovel-shaped currency widely used during the Spring and Autumn and Warring States periods, with a form thought to be derived from agricultural tools, making them one of the earliest forms of cast currency in China. They were mainly circulated in the Zhou royal domain and in the states of Jin, Zheng, Song, and Wei. The earliest forms included bridge-foot and pointed-foot variants. Scholars generally agree that square-foot spade coins originated in Wei and were later adopted by other states. The states of Yan, Zhao, and Qin also imitated spade coins from the Three Jins to facilitate trade or compete in regional markets. Compared to those of Jin, spade coins from Yan featured narrower necks and coarser casting. Overall, the evolution of spade coins progressed from hollow-headed to flat-headed designs; shoulder shapes transitioned from broad to narrow, flat or raised to drooping or rounded; foot types evolved from bridge-foot and pointed-foot to square and rounded feet; waist sections shifted from arched to flat or pointed; and the general form became progressively lighter and thinner. The circulation of spade coins declined following Wei’s defeat by Qin and ceased entirely after the First Emperor of Qin unified the currency system.