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Sui Dynasty
Daye Wu Zhu
(Broad Rim, Large Module, Thick Characters Version)
隋
開皇五銖
(闊緣大樣粗字版)
Item number: A4363
Reference number: DCD#217-2; WZTK#4157
Year: AD 581-601
Material: Bronze
Size: 25.0 x 25.1 x 1.2 mm
Weight: 3.85 g
Provenance: Spink 2023
This Wu Zhu coin was minted during the reign of Emperor Wen, the founding sovereign of the Sui Dynasty, and is occasionally referred to as the Kaihuang Wuzhu. The currency adopts the archetypal square-hole form; however, in contrast to the various Wu Zhu iterations produced during the Han Dynasty, Sui specimens are distinguished by prominent and robust outer rims on both the obverse and reverse.
The obverse bears the seal script inscription “Wu Zhu” (Wuzhu) positioned to the right and left of the aperture. Notably, the two intersecting diagonal strokes of the character wu (五) are relatively straight, diverging from the more pronounced curvature characteristic of pre-Sui Wu Zhu coinage. Furthermore, an inner border is present on the side adjacent to the character wu. Regarding the character zhu (銖), the head of the jin (金) radical inclines inwards, and the zhu (朱) component features a “broken stroke” (duanbi). The reverse is plain (guangbei), devoid of any patterns or inscriptions, and the specimen possesses a dark green patina. A defining feature of Sui Wu Zhu coinage is the substantial square inner border on the reverse. These specimens possess a larger module with a broader outer rim and bolder calligraphic strokes; they are noted for their refined craftsmanship and are frequently recovered from sites in Xi’an, Shaanxi, and Luoyang, Henan.
Upon his accession in AD 581 (the first year of the Kaihuang era), Emperor Wen (Yang Jian) sought to rectify the prevailing monetary chaos—characterised by the disparate weights of preceding currencies like the Wuxing Dabu and Yongtong Wanguo, as well as rampant private minting—by decreeing the issuance of a new currency. While retaining the “Wu Zhu” inscription and emulating the form of Western Wei coinage, the new coins were increased in weight, with the regulation specifying that one thousand coins should weigh four jin and two liang (averaging approximately 3.2 grams per unit), including defined rims for both the face and the aperture. To enforce this transition, the authorities implemented a rigorous “Sample Wu Zhu” (Zhiyang Wuzhu) system, displaying standard specimens at capital markets, provincial kiosks, and border passes; any legacy or private currency failing to match these standards was subject to confiscation and smelting, with violators facing capital punishment. Early issues were noted for their refined craftsmanship. During the Kaihuang era, Emperor Wen permitted princes such as Yang Guang (Prince of Jin) and Yang Liang (Prince of Han) to establish mints in Yangzhou, Ezhou, Bingzhou, and Yizhou. The most celebrated variant, the “White Coin” (Baiqian), acquired its name from the pale hue resulting from the government-mandated addition of tin and pewter to the alloy. These coins feature delicate calligraphic strokes, with the intersecting lines of the wu character rendered in a curved style, reflecting an aesthetic synthesis that incorporated the strengths of the Southern Chen Dynasty’s coinage; it is highly probable that these were produced under Yang Guang’s supervision in Yangzhou. However, during the latter years of the Daye era under Emperor Yang, the central authority eroded, leading to a collapse of the monetary system alongside the political order. Currency became increasingly debased and lightweight, culminating in a period of extreme disorder where clipped iron, leather, and pasted paper were utilised as surrogates for money. As the final official issue in Chinese history to employ the Zhu-liang weight-based system, the Sui Wu Zhu was formally superseded by the Kaiyuan Tongbao currency system in AD 621 (the fourth year of the Wude era) and subsequently ceased to circulate.