I have a cross reference list for Sears, but can't find 4c on it...quick google search suggests a bolt action.
DO you have any additional info? Pictures?
Not finding 4c on my list doesn't mean too much, as fellow CGN'ers have produced pictures of an 8C that turned out to be the Cooey 64 (as suggested, it should be a Canadian 6C).
There was a model 6C that was made by Cooey for Sears that was the model 64. However, I'm not aware of a model 4C that was made by Cooey for Sears.