It think that it is also important to note that with the exception of high-end vintage watches, auction results, while interesting, are not necessarily a very accurate gauge of the overall market. Most people who bid in auctions are already prepared to pay over market values, as premiums are typically 20-30% of the hammer price. Also, if one is going to use such data, then unsold watches should also be factored in. After all, if a watch fails to reach its reserve, then by definition the low valuation was too high.
Historical eBay data would be a more accurate guide to values of the vast majority of watches sold, in my view.
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