Stack's Bowers Galleries, February 2022 Collector's Choice (World) Auction, лот 73009 ARGENTINA. La Rioja. 4 Reales, 1850-RB. NGC MS-65.
KM-20. Pop: 1; no other graded in Mint State by NGC. An unusually well preserved and attractive coin, exhibiting only the slightest of strike weaknesses on the centers, but otherwise boldly detailed. The surfaces are endowed with soft, full luster and uniform, light gray toning.