I would not worry about the marks, more about that model and its case structure. I had one a few years ago. It is a special pressed case back with a kind of glue seal. Positive, and thats why I would not worry about the dial marks, is that this cases are absolutly sealed and try for a 100 years. Negative, you need a special tool from Omega to open the case, not every watchmaker is able to do that and as your contact mentioned you most likely will scratch the case. Consider higher maintenance costs and more difficulties to find the right watch maker to service it, Also be aware that there are no strap options as the bracelet is integrated into the case with a very small lug size
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