Tonga has a very colourfull and attractive issue of banknotes.  Due to the climate (A common occurance on most island nations) not many early banknotes have survived in a top condition. Since the first issue in 1921 not much has changed from the design until 1966. The first issue 1921 to 1935 (Pick 1-4) had stirling printed on the right. The 1935 to 1939 issue (Pick 5-8)  had stirling deleted by black overprint. The 1940 to 1966 (Pick9-12) had the denomination of the note instead of stirling printed on the right. The Tongan predecimal issues have many different signatories on them.
      








Tongan Banknotes
Decimal issue
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Treasury notes 3rd type