I have,Two yrs ago I sold on the bay A hamilton 950 B,Mint,14K to a stellar buyer from Germany,Fully insured express mail was 65 USD,The watch got as far as New york and disapeared,I filed a claim, after about a month I was told the USPS would refund my $65 but not the $2600 insured and paid for value.
The lesson I learned was: Watches are considered Jewelry By the USPS and as such need to be shipped registerd mail,Full disclosure was made on the customs docs,WATCH,Value,$2600,the moron behind the counter said nothing about registerd mail being required,major loss for me:(