That's an early model from Ret Bar Mfg. It is a single wheel (left wheel) drive. I don't see any gear shift controls, is it a coaster brake only model?
The tires are 24 x 1 1/4, 1 3/8 S-5 S-6. Not very common today.
Here's the single most important thing to remember when working on one of the early models, MEASURE AND SET THE TOE IN. They like no more than about 1/8" toe in, just measure both the front and the rear tire edges and adjust the wheels as needed. This is an often over looked adjustment and it makes riding much easier when it's adjusted correctly.
All BIG BASKETS RULE.
John