Panerai have used a number of movements from different manufacturers over the years. Leaving out vintage with the Corteberts, the "modern" Panerai's have used the ETA 6497's and the ETA 7750's you mention. The 7750 variant with the chronograph parts removed is what I have in my PAM 104, and like any other 7750 based watch I've ever handled it is reliable and accurate:
They have also used full chronograph versions of the 7750 in some of their chronograph watches, including some that were modified for additional features such as flyback and even rattrapante. They have also used the Lemania 1872 manual wind chronograph movement for a number of models.
In addition the GMT/alarm movement used in the PAM 098 is based on a Girard Perregaux movement - Cal. 59 from memory.
In the PAM 192 they used an 8-day manual wind movement that was based on a JLC caliber.
Most of the current line are "in house" and presumably made mostly by Richemont, so not just your average maker.
So if you take more than a passing glance at what these movements actually are, it runs a little deeper than just 6497's and basic 7750's.
Cheers, Al
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