Vintage cars have ups and downs for particular models based on the fashion of the day. There have been bubbles with specific models also.
What tends to happen is that when a "bubble" forms around a really rare model, there tends to be a "halo" effect. These early Speedmasters look like a good example of that. The earlier 1950's Speedmaster models are genuinely rare, have always been rare and will continue to be rare. What has changed is that there is now money in the market, but very few good examples of these to buy anymore. So that money has moved down to the next level, the models that are very similar to the earlier rare versions but are later and not quite as rare.
Because they are not as rare, the prices on these second level watches tend to be more volatile. A small hiccup in sales prices of the really rare ones will cause a big shake out in the market, as some collectors will have an opportunity to upgrade. Then those collectors will need to sell their second level models to fund these purchases, creating an increase in supply for which there may or may not be a demand.
Looks like Microeconomics 101 to me.
gatorcpa
PS - BTW, none of this has any bearing on how "good" a model is. There are plenty of Lemania and other brand watches with the same movements that sell for fractions of prices realized for early Seamasters. Please don't insult my intelligence by telling me that they aren't as "good". The name on the dial and the design is important, but doesn't make the watch function any better.
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