Thailand
Rama IX gold Proof "White-Eyed River Martin" 5000 Baht BE 2517 (1974) PR69 Ultra Cameo NGC, London mint, KM-Y104. Mintage: 623. A wonderful representative of this very popular Conservation type; even close inspection with a loupe gives no clue as to why it has not been considered a perfect coin. Immaculate, with matching matte frost to the edge and central devices separated by deep reflective fields.
https://coins.ha.com/itm/thailand/thailand-rama-ix-gold-proof-white-eyed-river-martin-5000-baht-be-2517-1974-pr69-ultra-cameo-ngc-/a/3081-31258.s?type=CoinArchives3081
HID02906262019
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Estimate: 5000-7000 USD