Patek Philippe

In the late 70s Patek was juggling four automatic movements: 240, 28-355 (JLC 920), 27-460, and 350. They wanted a thin, automatic movement with sweep seconds that wasn’t the 350. Eventually this movement family, and the 240, would replace the other three...  

I’m amazed how thin the movements were 40 years ago. Thank you for sharing.

Your analysis is as detailed as merciless for a movement and a manufacturer that represent the pillar of watchmaking. Well done, waiting for your next topic

I'm fairly familiar with the 315, 324, and 330 movements. But didn't know much about the 310! Thank you for this! And give us more details about the Chinese clones of the 324!!! And feel free to mention that Dadan supplies Atelier Wen! I don't mind. We're... 

The base 310 was used in a few Calatravas with narrow bezels. The only difference afaik between the 310 and 335 are the hour wheel, minute bridge, date wheel, and the 335 has two riser plates on the dial side. On Dandong’s infamous SL-4530, nearly all par... 

Well done ! Did you spend much time on the research ?