Dudley Moore Blakely, designer of the ¼, ½ and 1 Koula coins of Tonga (obverse and reverse), the reverses of the 1 and 2 Seniti 1967/1968/74 coins (with the turtle) and all the obverse coins with the Tongan seal.
Source: Royal Mint Annual Report 1963, page 4, 12 and plate D: https://library.royalmintmuseum.org.uk/archive/royal-mint-annual-reports/royal-mint-annual-report-1963-volume-no94/1799124?q=tonga
