"I am looking for information on the Bernardelli P One in particular."
hi,
ordinary Italian product. Great effort on external design and much less on inner things.
The plastic guide rod made of a polymer which is the ceapest lokking I have ever seen on a real handgun.
Otherwise these guns work, but nothing special, average trigger, average accuracy etc.
No official LEO or Military unit ever adopted them, maybe it shows their real value.
If you can get one cheaply, it is a good plinker, but I would not consider it for any serious work.