Turkey
Republic Mint Error - Reverse Brockage gold 100 Kurush 1990 MS65 NGC, KM872. A very rare and unusual modern gold brockage, one which persists at the gem level grade of preservation. The obverse bears a perfect incuse version of the reverse design, both surfaces absolutely pristine and lustrous.
Ex. Feeling Good Collection
https://coins.ha.com/itm/turkey/turkey-republic-mint-error-reverse-brockage-gold-100-kurush-1990-ms65-ngc-/a/3085-32041.s?type=CoinArchives3085
HID02906262019
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Estimate: 600-800 USD