When I bought my first Rolex Sub in 1970, the dealer had me bring it in after two weeks to adjust the mechanism. He said it would be normal to be off. Currently I have a NOS SD40 that I bought that is +2 consistently right out of the box. I considered that to be good. However after my D series SD40 went to Vanessa in CA for a complete service, it came back and initial check show it in the +1/+2 range for 3 days and then I checked it again and it was 0 deviation and has remained perfect for 3 weeks now. According to what she told me in our last conversation online that is what she expects from the ones she services. I used the NIST Atomic clock on line to check mine and as long as I do my part when I set it, it works fine.
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