I've worn it since Sunday, power reserve and accuracy are OK... And I tried to wind another PreV Panerai and it feels the same with mine...
Well all I know that movement are the same UNITAS 6497 but different decoration..
I guess I'll need to check one more time, compare it to my Vendome models again.. And maybe consult to an expert on watch movements here..
But I somehow doubt that it needs a service..
Anyway thank you for your answer Nicolas!
Best,
Sam