Just some comments on the PH rifles with SB made sporting style receivers...
The first ones had the full C style internal collar in the receiver ring. The only cut is to clear the extractor, so the action enjoys the benefit of Mauser's safety breeching. The second version yielded to manufacturing efficiency, and the left side bolt lugway is broached right through, so the collar is interrupted, with arches top and bottom. The final version has no internal collar, consequently no safety breeching.
I do not know when the receivers transitioned from machined forgings to finish machined castings.
I assume that the barrels were Spanish. In my experience, they are hard. Hammer forged. This opinion is based on machining them and on observations of mishaps resulting in barrel failure. Front sight ramps were secured by a single screw and two dowels. The three holes are close together, and wall thickness from the bottom of the holes to the bore is minimal. Fired with a muzzle obstruction, barrels would crack through the holes, and occasionally blow out pieces. Most other makes would simply bulge. The most dramatic example I observed was a .30-06 fired with its bore plugged with snow; the barrel broke into 7 pieces, all the way back to the receiver ring.
The stocks were made by Sile, in Italy.
Wood and metal finish was very well done, and the rifles are accurate.
The detachable box magazine version is clever, from the standpoint of altering the design to accept a detachable magazine, but is otherwise a mickey mouse abomination. If you have a "C" model, don't lose the magazine. Treasure it, because if you lose it, it will take a small fortune to buy a replacement.