It is your choice, as a seller, as to where you are willing to sell and ship your items to. If you are not willing to ship worldwide, please notify potential buyers by specifying in your ad listing where you're willing to sell.
Quite a few sellers on OldRide have sold vehicles outside of the country before, and it is becoming more common for Classic Cars to be shipped overseas. However, that doesn't mean that you shouldn't approach with caution (as with all potential buyers).
Selling a Vehicle to an International Buyer:
Selling Tips - Be Cautious