Thailand
Rama IX gold "White-Eyed River Martin" Proof 5000 Baht BE 2517 (1974) PR67 Ultra Cameo NGC, London mint, KM-Y104. Mintage: 623. One of the more popular Conservation Series issues, particularly in such impressive grades as this; featuring a perfectly frosted portrait of the bespectacled Rama IX in contrast to the watery fields behind.
https://coins.ha.com/itm/thailand/thailand-rama-ix-gold-white-eyed-river-martin-proof-5000-baht-be-2517-1974-pr67-ultra-cameo-ngc-/a/3084-30367.s?type=CoinArchives3084
HID02906262019
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Estimate: 3000-4000 USD