Although as per my post to Smironov above, it seems that the later generations of CEP models has more and more parts crafted out of Pt950 when compared to the earlier models, of which I can confirm that the indexes, (12 of them in my PC CEP), Maltese cross, and the baton hands are all crafted from 18k white gold.
AFAIK no CEP models have any movement parts crafted out of Pt950, although if anyone knows anything about the latest model, such as the Traditionnelle Tourbillon Chronograph, please do share!
Best always
Stephen