Don't think I ever saw a nickel-plated knife, those we liked were all bone-handled. I also remember some with plastic, with advertising or fancy pattern, mostly poor quality. I do have a silver-colored (silveroid) pocket knife, but that dates from the 1890s.

Sometime when adult I acquired a Wilkinson Sword stainless steel pocket knife. A dress knife, not suitable for games.

Knives for children, then, started to disappear sometime after the 1960s. I don't recall my children or their friends having Case-type pocket knives.