Austrian Netherlands
Maria Theresa gold Pattern 10 Souverain d'Or (Ducaton) 1751 AU58 NGC, Antwerp mint, KM-Pn2 (Rare), Fr-139 (under Belgium and Franz I), Eypeltauer-527, Herinek-667 (under Franz I), Delm-213 (R3), Vanhoudt-845 (R3). 55.42gm. Described in the Standard Catalog of World Coins and in Delmonte as a Pattern issue, this massive gold type depicts the opposing portraits of Franz I, Holy Roman Emperor, and his wife, Maria Theresa. Overall the quality is exceptional, especially given the size and age. The slightest hint of wear on the high point of each cheek perhaps accounts for the assigned grade, but the designation fails to justify the sheer eye appeal of the piece, the surfaces of which positively glow with a smooth, watery reflectivity that lends an altogether Prooflike appearance. Indeed, as a Pattern issue, it is not unlikely that this type was struck upon specially prepared dies, and perhaps an attribution of Proof would be more apt. Cataloged as extremely rare by Delmonte, with a similar rarity indicated by Vanhoudt suggesting that he believed the type to become available only once every 10 years, Delmonte recorded only two examples--one in the Cabinet de Bruxelles and one in a private collection. For reference, the last example to come to auction brought 110,000 CHF in June 2020. Undoubtedly extremely rare, and worthy of close study.
https://coins.ha.com/itm/austrian-netherlands/austrian-netherlands-maria-theresa-gold-pattern-10-souverain-d-or-ducaton-1751-au58-ngc-/a/3096-30123.s?type=CoinArchives3096
HID02906262019
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Estimate: 20000-40000 USD