It's a murray built bike, I'd guess mid 60's, perhaps a 65' (but thats just a guess). Murray built bikes sold under their own name as well as for sears (J.C.Higgins) and as Western Flyers mainly.
Thanks, I checked the Murray link to try and decipher the serial. Trying to determine whether its and MO, M0(zero)..Not sure. Picked up these tires and tubes for $2 at the flea market today? Thought they be a good fit for this frame. Are they period correct? Theyre 20x1.75. They'll clean up well.