I don't know if I deserved it, but God, it is good to have it!
I compared my homework with the pictures I found here and there, and with the informations I could gather at the Heritage Department, and with Collectors.
I also noticed that this Polaris 65 was untouched. The movement is here to bprove it, as well as the bevels.
So yes, I strongly believe that this " plain " case back is good, and existed on, at least, the very first Polaris 65, as well as on the Protos from 63.
I will try to post some better pics I already took, later.
Best, and once again, thanks, my friend.
Nicolas.