+4.5 is fine, and within spec. There is accuracy and regulation, accuracy is how consistent it is, so a watch that is +4.5 every day is more accurate than a watch that is +1 one day and -1 another. Regulation is effectively the offset, and can be easily adjusted but to meet Omegas standards is cannot be negative and must be positive. This is because a watch that is fast can easily be corrected once every week or two by simply hacking it until it matches atomic time again, while a watch that is slow has to be set forward by a minute or more before then hacking, which is a slower and more frustrating process.
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