Yeah, if you can find someone who would be willing to trade weapons for a small piece of metal.
Again, all this talk of a financial collapse is nonsense, but if something like that were to happen, we would be looking at a Mad Max type situation. Gold and silver coins/bars would be useless if there is no economy. People will need food, fresh water, heating oil, clothes, etc. not little round pieces of metal. It offers nothing that will help people survive.
If anyone really thinks that the world's economy is going to collapse you really should be hoarding tobacco, alcohol, weapons, ammo and food. Those will be the only items that have any value for at least the first few generations after this collapse. Once everything begins to stabilize, then perhaps actual money will start being used but all the hoarders will be long dead.