damn, it turned out my girlfriend with her friend play a joke on me. She took the package, opened it and put there some really shitty plastic watch (dunno where she got it from). She closed the package and left in front of the door.
This morning she switched the watches again when I was taking a shower. When I opened that box again I was what the hell - then I knew it was her since she's a big jokester.
But yesterday I was quite pissed off when I saw that crappy plastic watch