During the time the subject gun (as well as the two double rifles, sold by Guns International, linked above) was made Heym used "Krupp Special Laufstahl" and made their own hammer forged barrels at the Muennerstadt plant. There is no doubt about this as it was a strong point of their advertising, and you could clearly hear the "hammers" running in the plant. There is little to no doubt, in my mind, that the combo gun and both double rifles were made by Heym for marketing by Rottweil. I was not an assistant to the tube maker at Heym (although I would have been proud to have been), I was only a friend and customer of three different "Meisters" in the hunting gun section at Heym covering the 1960s through 80s-time frame. During this time the leadership was by August Heym, then Mauser after his death, then the Widow Heym after litigation returned it to the family. This transition resulted in several Heym manufactured products being marketed by others under their names, including automobile parts and artillery sub-caliber training devices (since I had used them in training, I recognized them being manufactured in the plant), as well as the Mauser branded 2000, 3000, and 4000 series bolt action rifles. I believe the combination gun under consideration here was one of those products.
Mike
