I am guessing that in many cases, the seller just doesn't know, in other words, if they have the papers, they are not looking at them when they post their ad. But I think you make a relevant point. However, if this were to become the standard for posting an ad, someone else will then make the standard that a post without this detail would be "worth less" than a post with the detail, but in practical terms, if you only provide the lot number, this gives you a date range for when it was produced and a this is likely even more relevant than the date you purchased the watch. So I am guessing that in most cases this is the more relevant detail.
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