I guess you could ask the question, is the part really defective? If it's fit for purpose, and if it came out of the Omega packet, it would be a stretch to call it defective because it doesn't have the logo. The problem facing the OP is, what are his options? He could demand a new crystal, but who pays for that and the labor to install it? Is it the watchmaker's responsibility? The OP's? Omega Corp? Perrin, the supplier? Or he could accuse the watchmaker of switching crystals on him, but that ruins the relationship and probably the chance of the watchmaker ever working on another of the OP's watches. Or he could accept an odd situation and move on. This is one of those situations where no one will be happy.
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