One of the first Gold Rush-era coins minted in San Francisco, a unique pioneer gold $20 piece minted by John G. Kellogg, will return to the Bay area for just the second time since it was made in 1854.

The Santa Clara Coin, Stamp & Collectibles Expo will feature one of the four known examples of the 1879 Quintuple Stella/Metric gold double eagle patterns, in the piece’s first public appearance in Northern California.