Nirosta is a trademark used on a variety of Krupp-manufactured stainless steels. It was first registered in 1922.
I don't know about how rare a Stenda is made with stainless steel, but I've not heard of 1930 Sauers being made of it, either.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.