I'm speaking a little out of turn here because I can't comment directly on Steyr (or Mannlichers) but H&H purchased Winchester lever actions, fitted them with Express sights of H&H's design, marked the barrels as mentioned ("Sighted, Shot, and Regulated...") and sold them in their Bond Street shop in the late 1800's. With the exception of refinishing the metal after sights were installed & markings added, all work was completed by the Winchester factory. Occassionally H&H added covers to the lever or recoil pads of their own design, but they didn't do the stock work, barreling, etc.

I would assume that these bolt actions were sold under the same or a similar structure.