Watch List notes:

Tonga - Proofset 1968 - 50th Birthday Taufa'ahau Topou IV (KM PS6) with 4 coins 20 & 50 Seniti and 1 & 2 Pa'anga (KM14/16/18/20), all countermarked '1918/TTIV/1968' - mintage 1.577 pcs. - Proof in original cardboard box and cloth packets as issued, the coins were first struck for the coronation of Taufa'ahau Topou IV in 1967 and countermaked for his 50th birthday a year later