1851 Liberty Seated Half Dollar. WB-2. Rarity-4. Repunched Date. EF Details--Cleaned (PCGS). This is a challenging issue to locate in all grades with a mintage of just 200,750 circulation strikes. The number struck was limited due to the fact that by the early 1850s the bullion value of newly minted silver coins exceeded their face value. From the Collection of Silas Stanley Roberts, 1888-1966.