Russia
USSR copper-nickel Pattern 5 Roubles 1958 MS64 PCGS, KM-C134. An extremely rare pattern, never officially released into circulation, with the overwhelming majority of the mintage melted down. Exceptionally lustrous, with some scattered, mottled toning. Currently tied with two other examples for the finest at PCGS with none certified above MS63 at NGC.
Estimate: 3000-4000 USD