Personally I wouldn't do it myself, if I were you. I would have a specialist do it. But if it's never been worn, then I'm not sure that opening it would be wise as it could disrupt the seal, dust and perished gasket could get into the movement, unless you were to service it before selling. I think the above comments about selling it at auction might not be a bad idea.
What's the case back like? have you got a shot?
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