How do I know that a Payer is giving me a legitimate payment?

[JoBob1]

I have read various scam scenarios here on Paypal and elsewhere online, and I don't know how I can be sure that someone paying me for a watch I'm selling (advertised on CraigsList) isn't using perhaps a stolen credit card, in which case their payment would be recalled and I would be out the money and the watch.  Is there any way to verify legit payment?  (The situation is they want to pay by Paypal and have me ship the watch to them.)  Squirrley?

Thank you.

[anaTrf]

ok so you know how it goes

got scammed by russian buyer

sent 2 expensive graphic cards there with tracking and all

buyer says he didnt  get it

then when tracking shows delivery he switches to ''not as described''

pay pal awarded return of the stuff he allegedly never got at the first place

what a joke!!!

he sends me box full of news paper-parcel got stopped at the Post in my country and got sent back immediately because they knew its a scam ( russians are doing it for so long now everyone knows it so now they open ALL parcels from russia )-custom declaration this guy filled says ''2 graphic cards''....BUT get this pay pal says its my fault I did not accept empty box and gives back refund to is scammer ...oh I got mail from post office in my country saying that parcel was sent back because it contained russina newspapers so got sent back  because of the custom offence of filling fake custom declaration..of course pay pal still sided with scammer and I lost money ...