Gibraltar
British Colony. Elizabeth II gold Proof "British-Sterling 250th Anniversary" 100 Pounds 1975 PR67 Ultra Cameo NGC, KM91. Mintage: 750. Celebrating the 250th anniversary of the introduction of the British pound sterling, this wonderful example displays exceptionally struck motifs atop subdued reflectivity in the fields. AGW 0.9169 oz.
https://coins.ha.com/itm/gibraltar/gibraltar-british-colony-elizabeth-ii-gold-proof-british-sterling-250th-anniversary-100-pounds-1975-pr67-ultra-cam/a/3096-31079.s?type=CoinArchives3096
HID02906262019
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Estimate: 1300-1500 USD