1/2 Tostão 'o-o' - João III 2nd type, Porto
€1.00
| Issuer | Portugal |
| Year | 1555-1557 |
| Type | Standard circulation coin |
| Value | 1/2 Teston (Tostão) (50) |
| Currency | Real (1517-1835) |
| Composition | Silver (.9167) |
| Weight | 4.5 g |
| Dimensions | 24 mm |
| Thickness | |
| Shape and Technique | Round (irregular) Hammered |
| Orientation | Variable alignment ↺ |
| Engraver(s) | |
| In circulation to | |
| Reference(s) | Gomes#J3 89 |