If you are unaccustomed to mechanical watches, and particularly manual winders, be certain you are wind it fully, until the crown no longer turns. If you already are doing that, then I would suggest the seller should send it back to the shop for a do-over! Your Omega likely never did keep the time that a modern watch in good shape should keep. But you say it is 90 seconds slow in one position! It would seem to me there is something quite wrong for it to be out that much in the one position. The other rates you give are better, but they are not great either. If you are going to dabble in vintage watches, I suggest that you never pay a premium for a “serviced” watch. And have a trusted shop service it for you. That way, you have some recourse if you aren’t happy with the performance. Oh, and the Timegrapher might cause you to expect a higher standard of accuracy than the watch is capable of.
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