Tonga
Taufa'ahau Topou IV palladium "50th Birthday" Set 1967 (1968), KM-MS2var. Mintage: 400 sets. Comprised of three 1957-dated palladium coins (1/4 hau, 1/2 hau, hau), this set (the world's first palladium coins) was first struck for the coronation of Taufa'ahau Topou IV in 1967 and countermaked for his 50th birthday a year later (KM22, 24, 26). Seldom seen as such and sold with the original box of issue.
HID02901242017
Estimate: 3000-4000 USD