This is a spectacular reverse die trial from Clark Gruber and Co., the most respected and well known financial and banking company in the pioneer and Gold Rush days in Colorado. Clark Gruber and Co. opened a bank and mint in 1860 and became coiners, striking their own gold coins of proper weight. The denominations struck were $2 1/2, $5, $10 and $20ís. These pieces were accepted as currency since Clark Gruber and Co. was a well known private minting firm with an excellent reputation. This uniface die trial is a fascinating piece of Gold Rush history.