I disagree that it has no worth. It all depends on which watch.
I have extracts for all my SM 300's. For me it gives added value and piece of mind.
I'm sure if I was ever to sell one in the future it would make the sale somewhat easier and I would achieve a better price than for the same watch without.
Also if I was to buy a risky reference in the future and it came with an extract I would be prepared to close the deal faster and probably pay that bit more, thus adding value for the seller.
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