How much damage to a case is acceptable

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Is it generally acceptable to have scratches from using a caseback wrench? My local watchmaker worked on my fois last week and put some dings into the caseback facets. It doesn't bother me too much, I'm just wondering if this is something I should expect with continued servicings.

My feeling is a good experienced watchmaker shouldn't leave any marks on the case or movement. That said, to be honest, I've seen much worse damage by watch repairers than what's on your case back mrchen.