The only things I know about the Prinz is that they are made in Italy, are very expensive, and that about a decade(or more) ago, Gun Digest would run pictures of them with brief captions, but no real text descriptions. It was frustrating.
Their site can be found at Prinz-waffen, they are located in Germany. The owner is Oswald Prinz. It's hard to find anyone with hands on experience. I know they are very pricey.