It took me a long time to sort this out and I'm still not sure I have it totally right, but I'm willing to share.
We state in our All About the Seller section that it is the buyer's responsibility to ensure that items can legally be shipped to their country, and that the buyer is responsible for all duties and fees. If something goes wrong, we will refund the purchase price when the merchandise is returned to us.
Gold and silver coins and banknotes can be sent to Belgium, Canada, Germany, Denmark, France, Hong Kong, India, Ireland, Netherlands, New Zealand, Norway and Singapore. Can be sent to Malaysia only by insured priority mail and only if the value is less than $50.
Silver coins and banknotes can be sent to Austria.
Base Metal coins can be sent to Austria, Belgium, Canada, Germany, Denmark, France, India, Netherlands, Norway and Singapore.
All coins can be sold to United Kingdom, but only by Registered First Class Mail or insured Priority Mail.
Stamps cannot be sold to buyers in Italy.
Do not sell anything to Brazil. They prohibit almost everything and I decided it wasn't worth the effort.
Priority Mail International is automatically insured up to around $65. Additional insurance can be purchased to SOME countries, but not all. I haven't had time to sort it out so I don't offer our high-priced items to other countries. Someday I'll take the time to figure it out. I discovered this when I could not insure a package for $150 to South Africa. I shipped it without full insurance and it got there, but never again.
For items other than coins, banknotes and stamps, the bulk of our items are under four pounds, so we ship by International First Class whenever possible. It's MUCH cheaper than Priority Mail. If the value is under $20 we take our chances (no insurance), but we do not ship to Africa, Asia, North America or South America. There are countries in these continents where mail regularly disappears, so we decided it isn't worth taking a chance. We do ship these items to these countries (have to check their boxes): Austria, Australia, Belgium, Canada, Denmark, Germany, France, Hong Kong, Ireland, India, Netherlands, Norway, New Zealand, Portugal, Sweden, Singapore, United Kingdom and South Africa.
For the non-coin non-banknote items that have a value between $20 and $50 and weigh less than 4 pounds, we ship by Registered First Class International to every country and continent except Brazil.
I worked these out early, use the List Similar function to keep them straight, so it's not that bad now that I have it set up.