I would like to know what the import duty and VAT is on imported silver coins into the USA. Does anyone know this or where I can find it. I have been searching around the web and through the customs pages of the US gov't, but have not yet been able to find exactely what I am looking for.

I would also be interested to know if there would be any difference if these coins were bought in the US, then shipped overseas and then brought back to the US, if the duty and tax would be any different or not?

In addition to Silver would like to know the same about gold and platinum..