Hello. Looks like your bike has a 3-speed rear hub that is missing some parts. I see the push-rod sticking out of the end of the axle. Don't lose that. This should be covered by the bell crank and cable connector. You'll also need the shifter and cable and a few other pieces to make it complete. These are hardy nice riding machines once tuned.
With that push rod in the rear hub it looks like that might be a Shimano 333. I'm thinking that may be a replacement wheel. Seems it would have been either a "Sears " stamped hub or maybe a Sachs Torpedo 3-speed hub. Without the shifter it'll be stuck in third gear making it hard to peddle. Parts are not hard to find to fix that if you wanna make it a rider.