Estados Unidos silver Proof "Libertad" 1/4 Onza 1999-Mo PR69 Ultra Cameo NGC, Mexico City mint, KM611. Mintage: 600. Though a fractional Onza issue, dates that saw Proof production this low are in heavy demand, especially at the Proof 69 level. HID09801242017 © 2023 Heritage Auctions | All Rights Reserved

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