Thailand
Rama IX 3-Piece gold & silver Proof "Conservation" Set BE 2517 (1974),
1) "Sumatran Rhinoceros" 50 Baht, KM-Y102a
2) "Brown-Antlered Deer" 100 Baht, KM-Y103a
3) gold "White-Eyed River Martin" 5000 Baht - PR69 Ultra Cameo NGC, KM-Y104
Amongst the most popular sets in the entire Conservation series, particularly for the 5000 Baht here presented in exceptional PR69 preservation with a pristine layer of frost to the devices.
https://coins.ha.com/itm/thailand/thailand-rama-ix-3-piece-gold-and-silver-proof-conservation-set-be-2517-1974-total-3-coins-/a/3081-31260.s?type=CoinArchives3081
HID02906262019
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Estimate: 5000-7000 USD