1. As a matter of discretion or "just because I don't like people knowing my serial numbers", I have little respect. Vintage watches basically all have physical imperfections that are as useful an identifier as any serial number. And if you don't want people to know "just because", I have even less respect.
2. As a matter of opening yourself up to fraudsters claiming you've stolen their vintage Ebel chronograph - I see the chances as less than the lottery.
3. As a matter of protecting the integrity of online sale photographs - there are hundreds of thousands of other photos out there that can be used for that purpose. Your efforts are without any real power.
4. As a matter of preserving the sanctity of a serial number - fraudsters don't need to see a physical serial number to know that a watch line should fall between, say 30,000 and 35,000. They can just pick a number. And if they really need a real confirmed number, look at the answer to number 3.
People can do whatever they feel it right - but I still can't see any tangible, realistic justification.
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