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640 Réis - João, Prince Regent
| Issuer | Casa da Moeda da Bahia |
|---|---|
| Year | 1806-1808 |
| Type | Standard circulation coin |
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| Reverse description | The central device depicts the armillary sphere, an emblematic symbol of Portuguese navigation and the Kingdom of Brazil, rendered with fine meridian and parallel bands intersected by a diagonal armillary band, resting on a stylized support with arrow-like finials projecting to either side. The sphere occupies the majority of the field and is executed with notable engraving detail. The surrounding circular legend STAB·SUBQ·SIGN·NATA B, an abbreviation of the motto Stabilis sub quodam signo nata (born under a steadfast sign), runs along the periphery with dot separators. A fine toothed milled rim borders the entire design. |
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| Reverse lettering | STAB·SUBQ·SIGN·NATA B |
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| Additional information |
The Casa da Moeda da Bahia struck this issue during João's regency following the effective collapse of Portuguese administrative authority under Napoleon's pressure — the royal family's flight to Brazil in late 1807 transformed what had been a colonial branch mint into something closer to the operational center of the Portuguese empire. Salvador da Bahia held that distinction only briefly before the court settled in Rio de Janeiro and shifted minting priorities south.
KM#237 encompasses the transitional 1806–1808 window, meaning early strikes predate the flight and later ones postdate it entirely.