24 inch wheels?
Either the tank isn't original or bars and seat have been added.
Serial number should be on the LH rear drop out. If I remember right the first section of digits are the model number.
There are digital forms of the Sears, jc Penney, and Wards catalogs posted online. Nothing organized enough to search by model number, but if you search for "bicycle" on their site and go year by year, you'll eventually come across your model number in the catalog text(that is not digitized) and get an idea of what parts were originally installed.