Nice bike. Looks like Mahowald was a Minnesota bike shop selling bikes built by other manufacturers under the house name. You'll need a better expert than me to identify which factory produced your bike and when.
Thanks guys! Yes, it was a hardware store in Mankato, MN that put their own badge other mfr's bikes. This one is a Schwinn built, and I've seen Monark's badged as Mahowald on the Cabe. It has a sweet drum brake set up!