Sure it is but as Tattoo pointed out make sure you've done your homework and checked out the sellers feedback, return policy and of course the item. eBay and Paypal offer resolution options should anything go wrong for both the buyer and seller. Good luck with your search !
Buying from "Flea Bay" isn't on my radar. Just isn't.
Most of the 20+ pieces I've bought lately have been
from the Zon.
A few from sellers I know personally or have great
feed back. Just the way I roll!!!
Everyone pretty much hit it, just need to buy the seller. I've bought plenty on Ebay without issue, however I know someone who picked up a Tudor Pelagos that turned out to be counterfeit. PP will refund if that occurs within the appropriate time frame to dispute.
I've purchased more than a few, successfully. The one I didn't receive, eBay refunded me for, in full, promptly. As others said, do a bit of due diligence, but otherwise, I wouldn't worry too much. Expensive watches that could be fake are another story though, I think.
If you're worried about a watch, I would do some research on both the seller and their accepted forms of payment (paypal for safety). If you decide to move forward with a purchase, upon receiving the watch, one should take it to a respected/trusted local watchmaker just to be sure.
I'd make sure they're a seller in good standing (several hundred sales preferred) and ask for any additional photos. If you're in the same area as the seller, most will allow you to come see the watch. There are also tons of services which allow you to ship the watch for review at their secure facility and they mediate the purchase