1851 San Francisco State of California $20 Die Trial. K-4a. Rarity-7-. Copper. Reeded Edge. Proof-63 BN (PCGS).Vivid lilac and pale pink undertones backlight dominant medium brown patina on both sides of this attractively original specimen. Fully struck, as befits the method of manufacture, and sure to have no difficulty finding its way into an advanced collection of California Gold Rush and related coinage. This impressive $20 rounds out an amazing offering of all four denominations of San Francisco State of California copper die trials in this sale, which is fitting since most examples of these types entered the U.S. numismatic market as part of four-piece sets.From our (Stacks) sale of the John J. Ford, Jr. Collection, Part XX, October 2007, lot 3274.
