I wouldn't take the caseback off any watch I was selling, even if I were asked - I'm not a watchmaker.. You don't know this guy's skill levels. It's easy to not seat the gasket in place properly, or for it slip when resealing; and I know it's not a divers watch, but a hair or even a speck of dirt on the gasket can compromise the WR. It might also invalidate any waterproofing guarantees from the service?
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