Just kidding of course. But I caught that too.
Does the Observatoire have a stop seconds function? I believe the Peseux ebauche doesn't have this. The Dufour doesn't have a hack mechanism either as far as I can recall.
In the end, it's probably a distant concern once you have these on your wrist 
Thanks for posting these beautiful 'poor quality' pix!!!
HAGWE,
S