It's very frustrating Stephan, as there is very little you can do.
Maybe he is telling the truth, and has 'sellers regret', maybe he has been offered more money. If you won it at a low price, this may be the case.
You could ask him outright - ie. "If you have been offered more, I'll match it".. only if you really want the watch and the price is reasonable. I know this hurts, as you won fair and square, but it happens sometimes.

Stewart

: Hi all,
: maybe some one of you already has experiance in this situation.

: I won item (zenith el primero) last week, I was soooo happy that
: after 4 years I'll get them.

: today after week seller send me email he will not sell watches and
: he will keep them and he is sorry about it.

: But I NEED them as these are my dream watches. How to push him to
: sell? I gues eBay will not help.

: thank for any hints or help

: Stepan

: P.S. because we planned personal meeting I still didn't pay.