- Gem Mint State Uncirculated Guatemala silver medio (= 1/2) real coin.
- Variety with date 1880 overpunched over 1777.
- Assayer E.
- Rare combination of overdate (1880/77) and mint error (18/17).
- Certified by NGC to MS 64, Population Census: 2 coins, none higher.
- Lightly toned with lustrous surfaces, very appealing in hand.