Lazy eye sniper nailed it.
Pre 1968, serial numbers were not a federal requirement and may not have one.
just FWIW, JC Higgins was a generic manufacturer under the Sears label and were made by various major manufacturers.
My wife inherited a JC Higgins 410 shotgun that is rather unique, but it is made by marlin, which had a very similiar model number for their rollmark.