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2 Shu / 1/8 Ryō 'Shin-Nanryō Nishugin'
| Issuer | Edo Ginza (Silver Mint) |
|---|---|
| Year | 1824-1830 |
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| Currency | Ryō (1595-1874) |
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| Obverse description | Irregular rectangular hammered silver flan with a finely granulated field. Six columns of incuse Chinese characters in traditional regular script (kaisho) fill the face, arranged in a two-column format reading vertically from right to left. The inscription states the official exchange rate, declaring that eight pieces of Nanryō are equivalent to one ryō koban. The legends are boldly struck in relief against the textured background, with the characters displaying the angular, deliberate strokes characteristic of Edo-period mint engraving. The entire surface is encircled by a rope-pattern border typical of Tokugawa-era silver coinage. |
|---|---|
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| Edge | Vertical reeding on short sides |
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| Additional information |
The Shin-Nanryō Nishugin was introduced in 1824 as a deliberate improvement on the debased Nanryō Nishugin issues that had circulated since the late 18th century. The Edo Ginza raised the fineness substantially — the earlier type had dropped as low as .889 — responding to persistent merchant complaints about the reliability of the coinage in commercial transactions.
Production ran only six years before the type was superseded, limiting total output relative to its predecessor. The Edo Ginza's tight quality controls during this window are reflected in the unusually consistent silver content found across surviving examples.