Hello!
The second message on the forum gives us a guideline; but we can always have some particular cases. As a rule, common sense can be used.
On the 100 Lire note, the reverse should indeed be vertical. On the 150 Lire note, it could be either way, without any rule violation. =)
If there aren't too many examples, I suggest the referee make these adjustments. Mr. Robot may not be able to help with this.
Regards,
Vladimir