You have a gem which is also a bit of a mystery. The stock design, finish, scope mounts and the sling swivels suggest this was made in the 1920's or 30's. The engraving on the receiver looks well done, the finish is most likely NOT nickel but bare steel, so make sure you keep it lightly oiled to prevent rust. The most common rifle caliber is 8x57R ( rimmed ), I doubt it would be in any .30 caliber from this period.
The mystery part is the few markings. Berlin was not a big center for making civilian guns of this type, maybe this is either a name for this model, or the location of the dealer that sold the gun. P. Heil** doesn't ring any bells for a makers name. If you can get better photos of the markings on the underside of the barrels, and maybe on the table of the receiver, the experts could decipher more about it.
Overall a very nice gun in what looks like very good condition, the value could be considerable, don't let a gun store "expert" try and trade you for a plastic-stocked hunkojunk! If you want more information I'd suggest sending your photos to Rock Island Auctions, they have some experts on European firearms.
