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| 正面描述 | Central field dominated by a large Gothic initial 'I' (for Ioannes/João) surmounted by a royal crown, all contained within a beaded inner circle. The crowned monogram is rendered in bold relief in the Gothic style characteristic of early fifteenth-century Portuguese coinage. A beaded border frames the design, with the outer legend separated from the central device by a raised circular border. The overall design is compact and heraldic in character, consistent with hammered silver coinage of the Avis dynasty. |
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| 正面文字 | 登录 以查看详情 |
| 正面铭文 | 登录 以查看详情 |
| 背面描述 | 登录 以查看详情 |
| 背面文字 | Latin |
| 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 |
João I's reign saw Portugal pivot decisively toward Atlantic expansion — Ceuta fell in 1415, the same year this type begins — and the Crown's need to finance naval infrastructure and garrison costs drove sustained pressure on the silver coinage. The Porto mint operated as a secondary striking authority throughout this period, its output distinguishable from Lisbon pieces primarily through mint marks rather than any die quality differential.
The denomination itself, reckoned at 10 reais brancos, reflects a monetary accounting system anchored to the real branco rather than to the coin in hand — a abstraction that repeatedly confused foreign merchants trading into Lisbon's waterfront markets.