Thailand
Rama V silver Essai 1/2 Baht (2 Salung) RS 128 (1909) MS64 NGC, Paris mint, KM-E3, VG-Unl., LeMay-Unl., Krisadaolarn/Mihailovs-pg. 181, Plate F55. By Henri-Auguste Patey. By all measures a classic rarity of the machine-made Thai series, virtually unattainable in any condition, and perhaps even rarer that the Essai 1/4 Baht and Baht of the same set, with the 1/2 Baht remaining entirely unpriced in the Standard Catalog of World Coins. Originally ordered by Rama V during his visit to Europe as denominations intended for circulation, the coins did not reach Thailand from the Paris mint until after Rama V's early death--with the Baht, the only coin with any of its mintage released, largely melted down. Representing the last issue of the monarch as such, the coin at hand displays a delightful mottled toning and notable device frost. While we can locate no recent comparables, the Standard Catalog notes that a raw BU example brought $23,000 in Taisei's September 1997 Auction 25.
From the Dr. Norman Jacobs Collection of Thai Coins
https://coins.ha.com/itm/thailand/thailand-rama-v-silver-essai-1-2-baht-2-salung-rs-128-1909-ms64-ngc-/a/3084-30339.s?type=CoinArchives3084
HID02906262019
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Estimate: 8000-10000 USD