I have bought United States silver half dollars (1807-1839) on eBay from dealers in the U.K. and Germany, and I have never had any problems with either eBay, Pay Pal, or the vendors themselves. The problems have been with the very high cost of registered air mail, and the U.S. Customs inspection fee. Even though the reimportation (repatriation) of U.S. coins is duty free, the Customs Service still charges an inspection fee whenever it handles an incoming parcel. What incoming items the Postal Service decides to send to Customs and which it doesn't is entirely a hit and miss affair. If the outside of the package has a label that says "Contents: U.S. silver coins," then it shouldn't be sent to Customs unless there is something suspicious. Since a label like that might as well say "Steal this package," it is absolutely necessary to have it shipped by registered mail. The dealer's commercial insurance will not cover coins shipped any other way.