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Patek Philippe

True. 0.2mm difference.

 

The 240 is technically thinner than the 260 caliber. The 260 caliber also has a smaller balance wheel - I like bigger balance wheels with the 21.6K VPH slower beat. But the trend has been going towards smaller balance wheels with the faster 28.8K VPH beat. The 240 caliber also works rather well - as a base movement too! The 260 caliber hasn't really fully replaced the 240 yet. Even the new Cubitus movement in the 5822P is driven off the 240 caliber - logically I would've expected this mostly new movement to be driven off the 260 caliber.

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