Gold and silver coins are a store of purchasing power, not an investment. The value rarely changes, only the dollar price changes due to fluctuations in debasement of dollars. A shift to using gold and silver as a medium of exchange for goods and services should require no currency denomination. Only purity and quantity should be expressed on the coins. Segregated storage facilities should provide "debit" cards for electronic transacting in gold and silver, again by quantity and purity.
MAKE SURE YOU GET PHYSICAL SILVER IN YOUR OWN POSSESSION. Don't Buy SLV, or Futures or Pooled Accounts or any other BS paper silver product .Remember anything on paper is worth the paper it is written on. Go Long Stay long the bull market have even started yet