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Horological Meandering

They ought to make it! They really do!

 

It actually increases the costs of manufacturing significantly to make a summer extension system.  Depending on the design of the system.  For example, the latest Patek Philippe system on the 5811 is a very complex high precision mechanism with a lot of parts.  But if you're just looking at the Rolex system where a friction-fit link unfolds from itself (a much simpler system) the costs on that are much more manageable.  

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