My Fed case doesn't have an imprint. My guess is the imprint is the leather shop that produced it/them. My guess (and these are guesses) is that someone could get a higher grade case as a nice accessory for cameras. Possibly as a factory option, or as an aftermarket item, just like today. I know that cameras were a very nice gift to be given in retirement, award for heroism, distinctive service, etc. We have to remember that cameras were more of a special thing at one time. They were a real nice gift with genuine meaning. My guess is that it was very common to personalize the gift with little plaques, engravings, and so on. That was also a common thing to do around this time (I'm talking late 1930s through 1950s).
Ultimately, I doubt the plaque on Paolo's case is terribly special, unless it was given to your grandfather for distinctive service or something like that. Then it means a lot to you. Its also unfortunate that old leather cases are not given particular value among the photo gear market (of course, many are in rotten shape). It might be a very nicely made case, and works wonderfully to protect and carry the camera, but not terribly valuable. So, I'd use it to protect and carry the camera -- and look good while doing that!
If you're looking for a way to add monetary value to a camera-case combo (or just the case), I doubt you'll get much traction. It's possible there's someone out there related to I.P. or collects memorabilia from the special prosecutors ministry, but your chances of connecting with such people and conveying this "extra value" are small. In that case,😱 I'd simply enjoy the case and use it.