Anybody know about Italian Beretta / Bernardelli shotguns?

My dad has two old double barrel shotguns that he has had for many years. He's old and codgety now and these guns have gotten to the point that they are starting to deteriorate. I'll put them back in the cases and he'll take them out. I'll offer to have them cleaned and detailed and he'll have no part of it. It's to the point I'm about to go buy a couple guns and swap out with his just so I can get his restored before they suffer any real damage. As it is they are gummed up/dried up to the point nothing operates on them. Not being much of a gun enthusiast, I'm searching for any info on these, values and tips on refurbishing them correctly or any leads on someone that does this.

Here's the details. Inscribed on the barrel of one is the following. V Bernadelli Gardone VT. Also, acciao speciale cogne, and Made in Italy. This would be the "side by side " version, lots of intricate engraving.

The other, an over /under version. P Beretta Gardone VT, acciaio speciale al cromo molibdeno, Made in Italy. Again, lots of intricate engraving.

I'll try and get some pics if it helps. Hopefully I'll learn something. Ask me about an old Elsinore, I can help! Old guns......clueless! Just don't want to screw up anything especially if these have any real value. So thanks in advance for any advice.