So a few things jumped out at me immediately on this one, so I'll point them out for those who missed them...
A - finish here is rougher than I would expect - not conclusive but it was something I noticed right off the bat.
B - no pivots in the holes of the jewels - this is a major tell on movements where the fakers have simply added a plate on top, and a common feature of the fake 8500 movements that I've mentioned before.
C - the location of this escape wheel makes no sense at all - it's way above the balance so in relation to the escapement this is nonsensical.
D - you can see here the regulator for the 7750 base movement used - this is a pretty distinctive regulator, so one I recognized right away.
Panerai does used a stripped down 7750 in many of their older watches, since it's one of the few automatic movements available that has the constant seconds at 9 o'clock. On those (and this one I suspect) they remove the chronograph components, and the dial side parts are from the 7765, which has an instantaneous date change that flips right at midnight. The base movement here might be a Chinese clone since I would think they would want to use the cheapest thing out there.
Even if you don't know what the movement should look like, these are things that can help you spot a fake.
Cheers, Al