I rememb riding ones like your Schywmer , when much younger .
I recall them being very tough ole birds & quite forgiving to damage , all in all ... heavyweighted by todays' standards , but that builds strong bodies !
Many a lad has had a tale to tell about pedaling these old guys standing up , to make it up hills &/or to full-speed (we won't mention what happened when the chain slipped the sprocket) !
So happy to see that this one landed in your mitts , JoshandLisa !