Great Britain
George III gold Guinea 1798 MS66 NGC, KM609, S-3729. An exceptional survivor - the single highest graded specimen out of 281 seen by NGC and PCGS combined! This Guinea has managed to survive for 220 years without so much as a modicum of wear or significant contact mark, and has retained intense full luster. Though not a rare type nor year for the issue, to find an example so well-preserved as this is simply unbelievable, and indeed renders this piece (at present) conditionally unique. For the highest tier collector of Guineas, you need look no further for a 1798 specimen, as this offering represents the pinnacle of quality.
https://coins.ha.com/itm/great-britain/great-britain-george-iii-gold-guinea-1798-ms66-ngc-/a/3081-30765.s?type=CoinArchives3081
HID02906262019
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Estimate: 3000-4000 USD