| Type | Realia |
|---|---|
| By | Sealand (Micronation), issuing body. |
| Languages | English |
| Publisher | Sealand : Principality of Sealand, 1975. |
| Physical Description | 1 coin : 25 g ; 40.6 mm |
| Subjects | Bates, Joan (Princess), 1929-2016, dedicatee, depicted. | Micronations. | Coins — Sealand. |
| Notes | Obverse legend: “20 Sealand Dollar | Princess Joan I.”. Obverse type: Head of Princess Joan. Reverse legend: “1975 | The Principality of Sealand”. Reverse type: Sealand coat of arms. |
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