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1 Ryō 'Suruga Sumikaki Koban'
| Issuer | Japan |
|---|---|
| Year | 1589 |
| Type | Log in to see details |
| Value | 1 Ryō |
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| Composition | Log in to see details |
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| Diameter | Log in to see details |
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| Obverse description | Log in to see details |
|---|---|
| Obverse script | Log in to see details |
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| Edge | Plain |
| Mint | Log in to see details |
| Mintage | 1589: ND (1589) |
| Additional information |
The Suruga Sumikaki Koban belongs to the earliest phase of Toyotomi Hideyoshi's attempts to impose monetary order on a fragmented Japan. Struck in Suruga Province, the "sumikaki" designation refers to the ink-brushed inscriptions applied by mint officials — a quality-control authentication practice that predates the standardized stamp systems Hideyoshi would later enforce. These provincial koban predate the Tenshō Ōban centralization effort and reflect a transitional moment when regional gold production was being pulled under the control of a nascent national authority without yet being fully absorbed by it.