I find it hard to tell but here are some comparisons
Amstaff's pic where I marked the eledged flaws but to me it is hard to tell, 99,99999% swiss
here's a pic of a gen Panerai 6497-2, only the teeth on the centerwheel, crownwheel and barrelwheel look different to me, maybe the holes with the jewels....
As for the blue screws, as I understood correctly from a watchmaker, the color is obtained with heat for the complete screw, not just the top