US Nickel @ 25% nickel & 75% copper is the last common circulating coin money that is still worth its weight. Worth its weight in metal. Other coins are tokens or collector item. Worth vs denomination ore vastly different.
Our world is awash with paper currency.... Liquidity.
Our lowly Nickel is the last remnant that you can save without fee or commission.... worth its weight in metal.
Disclaimer: Mark Twain (1835-1910-To be continued) is unlicensed. His river pilot's license went delinquent in 1862. Caution advised. Daily Paul ☑