You can find them with fenders and a rack pretty easily. They're a simple 2x5 drivetrain.
They start out very heavy. The wheels/braking is terrible. -but-. If you swap the wheels out for something modern, perhaps do some minor drivetrain upgrades you'll wind up with a still-kinda-heavy but amazingly capable and cheap city bike. Plus, in some areas it has a bit of a 'sleeper' effect and will get lower attention from thieves.
Electra still makes them but they're quite heavy and too expensive. One could buy a much more useful urban IGH or 1x derailleur bike for the same amount. Like a Kona Dew.
https://waterfordbikes.com/SchwinnCat/flschwinn_1961_1970/19...
They also had a delivery bike that almost anticipates the modern baekfiets. And some department stores such as Sears and Wards had similar lines at somewhat lower prices.
I have a early 60s Schwinn that is still in good working order despite no maintenance other than lubrication and new tires.