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| 正面描述 | 登录 以查看详情 |
|---|---|
| 正面文字 | 登录 以查看详情 |
| 正面铭文 | 乾隆通寶 (Translation: Qian Long Tong Bao — Qianlong [Emperor] / Universal currency) |
| 背面描述 | Central square perforation framed by a raised square border divides the reverse field into left and right registers, each bearing one Manchu script word read vertically. Together the two Manchu words ᠪᠣᠣ ᠶᡠᠸᠠᠨ (Boo Yuwan) identify the issuing mint as the Board of Works (Ministry of Public Works) in Beijing. The characters are rendered in raised relief against a flat field, with a wide, plain rim encircling the coin. No additional ornaments or symbols appear in the field. |
| 背面文字 | 登录 以查看详情 |
| 背面铭文 | 登录 以查看详情 |
| 边缘 | 登录 以查看详情 |
| 铸币厂 | 登录 以查看详情 |
| 铸造量 | 登录 以查看详情 |
| 附加信息 |
The Board of Works Mint in Beijing was one of two imperially supervised mints operating in the capital during the Qianlong reign, the other being the Board of Revenue. Both were tightly regulated, with fixed quotas and periodic inspections, but the Board of Works issues — struck at the Boo-yuwan facility — were consistently plagued by shortfalls in copper supply as Yunnan provincial ore became harder to source in the latter half of the reign. The shift to brass alloys during this period was a direct response to that shortage.