I’m very very skeptical of that number… If all the US currency was evenly divided amongst the US’s population, each person would hold about $6600. But almost nobody actually holds that much cash in the US - that cash is mostly held by criminal organizations, individuals that can’t engage with the traditional banking system, and foreign governments. The Swiss Franc has similar utility to the USD in that regard, so I suspect that number is not representative of nearly all households.
Swiss Francs are far from a reserve currency, beyond the poor recognition of the notes outside of Switzerland and nearby countries, so I'm doubting too many are held outside of Switzerland. Euros or Dollars would be far better.
