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Tostão 'O-P' – João III 3rd type, Porto
| Issuer | Portugal |
| Year | 1555-1557 |
| Type | Standard circulation coin |
| Value | 1 Teston (Tostão) (100) |
| Currency | Real (1517-1835) |
| Composition | Silver (.9167) |
| Weight | 9.5 g |
| Dimensions | 30 mm |
| Thickness | |
| Shape and Technique | Round (irregular)
Hammered |
| Orientation | Variable alignment ↺ |
| Engraver(s) | |
| In circulation to | |
| Reference(s) | Gomes#J3 142 |
| Obverse description | Crowned shield with mint letters at each side Engraver error by putting mint letters in inverse order P (rto) |
| Obverse script | Latin |
| Obverse lettering | IOANES : III : R : PORTV
O-P
`N`s` and `s`S` are inverted |
| Reverse description | |
| Reverse script | Latin |
| Reverse lettering | IN HOC SIGNO VINCES
`N`s` and `s`S` are inverted |
| Edge | |
| Mint | O-P
Porto, Portugal |
| Mintage | ND
(1555-1557) O-P - -
|
| Catalog ID | 6854655390 |
| Comments | |
