PORTUGAL. 500 Reis, 1879. Lisbon Mint. Luis I. PCGS PROOF-63. KM-509. This handsome proof appears to be exceptionally <strong>RARE </strong>with only this example and one other from NGC ever being certified by either PCGS or NGC. Deep toning frames the rims of this special strike, with a richness of detail far outstripping the circulation issues and ensuring this example will be fiercely contested when it reaches auction.
