Spain
Amadeo I 5 Pesetas 1871 (1875) DE-M MS64+ NGC, Madrid mint, KM666. Very rare quality for the issue, with smooth fields and a blanket of rainbow-hued iridescence over both sides that produces wonderful eye-appeal. The finest example we've seen and currently the single finest graded at NGC. Worthy of pursuit from a top-tier set builder.
Estimate: 2000-4000 USD