I can't answer the question directly. However, there is a site called watchcount.com that lets you put in keywords like "omega speedmaster" and then shows you all the results sorted by most watchers to fewest watchers. At the moment, the most watchers is for a 1967 145.012 with 240 people watching.
I know that people "watch" an auction for various reasons, good and bad, but I think this is a decent way of finding out what's getting a lot of eyeballs on eBay.
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