I've read posts on a board for the NAWCC ( National watch and clock collectors) That a guy bid on a clock and won the auction (1k+) and the seller had stolen the ID for a legitimate seller with 200+ pos. feedbacks. No clock just posted pic's, So the buyer was out.
This has happened a few times, They will set the auction up as private so you can't contact the buyers if you know what up. A friend has a wed site selling clocks, He's had pic's of his clocks lifted and posted for sale on ebay with no way to contact the buyers.
If you buy through your credit card I think the card would cover the loss.
Be careful