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| 表面の説明 | 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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| 表面の文字体系 | ログイン して詳細を見る |
| 表面の銘文 | ログイン して詳細を見る |
| 裏面の説明 | ログイン して詳細を見る |
| 裏面の文字体系 | Latin |
| 裏面の銘文 | ログイン して詳細を見る |
| 縁 | ログイン して詳細を見る |
| 鋳造所 | ログイン して詳細を見る |
| 鋳造数 | ログイン して詳細を見る |
| 追加情報 |
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.