If you bought it from a dealer as true NOS, it should have warranty and certainly I would use it. Tell them it's not holding the proper power reserve.
Just a question - when you say you fully wound it, what does that mean? Using the crown? If so, how many turns? If using the automatic, I would test it again by fully winding through the crown. You want to be prepared for them telling you that you just aren't active enough when you tell them it stops too soon. If you have tested the watch by manually winding it fully, then they can't really argue the point (well they can, but they won't get as far).
Cheers, Al
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