MTF
[PuristS]
13383
Cartier 430MC movement
HPoirot,
We don't get clear large photos of the Cartier 430MC movement and I cannot show the Piaget 430P movement that it is based upon. 
I have not wound the Cartier Ballon Bleu Extra Flat watch but have a number of Cartier and Piaget watches with the same 430-movement. The movement is very easy or "light" to wind even with the fancy Cartier polygonal and carbochon crowns. I suspect that the Ballon Bleu crown is not an issue too but the best solution is to let the current Mrs HPoirot try winding one at the boutique.....it's a good excuse to make a trip.
Regards,
MTF
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Cartier 430MC movement
HPoirot, We don't get clear large photos of the Cartier 430MC movement and I cannot show the Piaget 430P movement that it is based upon. ;) I have not wound the Cartier Ballon Bleu Extra Flat watch but have a number of Cartier and Piaget watches with the ...
I can confirm: it is easy to wind the watch.
And sorry, as Melvyn said it, the watch has a solid caseback... Fx