I took the front base off,,no name or #'s on the back. Screws are tightly fitted to the countersinks.

The front is deffinetly a one piece affair. The barrel outside diameter is even with the lower side edge of the base. Making it with 2 pieces would have shown on the inside radius of the base if it were.

The rear swivel is a two piece assembly,,but the portion seen in the pic,,the barrel/sleeve and it's tapered base are all one piece.

That was then silver soldered to the screw with a like diameter flat top. The assembly was turned after soldering to trim the two parts together.
Assembled in the stock the joint never shows as it's just below the surface. Even out of the wood it's hard to see.

Thanks for the info R/M Bill on the other Oberlies rifle hardware. This is the first one I've had and haven't ever examined others closely enough to catch these details..