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It's always a challenge to date unmarked paper dolls, but this one is especially challenging. It might be the 1950s, but wasn't the Cold War in full swing by then? Would an all-American brand like Kellogg's show the hammer and sickle and a benign Russia at that time, and risk being labeled "fellow travellers?" Hmmm....I'm thinking this is immediately after WW2-- perhaps 1947-- when Russia was still perceived as an ally, not a threat. You never know where paper dolls will take you -- from fashion history to politics!
If you want to see the other Krumbles in my collection, search this blog for "Krumbles."