So as not to confuse the silver coins with the circulation-strike copper-nickel coins, they were issued exclusively to collectors in unique 'Blue' and 'Brown' packs. 400 silver coins, it actually created two different versions: Proof and Brilliant Uncirculated.
When the United States Mint in San Francisco struck the. Was it meant to be a secret? Probably not, but with so few made, it easily can be slated that no one knew about it until now. Over 100 million coins were made, but only a fraction (less than 3 %) were made out of silver!
