Hard to say what kind of bike that is. Forks put it in the 80s but they could of been swapped. Serial numbers arent always a precise way of identifying it. I would guess maybe a Columbia or Huffy? Matching the Model A would be cool or a dayglo 80s color? Either way, looks like your having fun and thats what its all about! I dig Old Model A's! Is that a Victoria? 30 or 31?
The Jamis Earth cruisers were made from 1979-86..Yours looked to be completely original.. There not really a high end cruiser, but putting some cross bar and removing the chain guard, you have a cool BMX cruiser..The tires (sand jam)on these bikes had sea shells for treads..I ride cruisers like that one out here in California..I wish I had asked what your plans were before you sanded off the paint, I would have liked to have an original Earth cruiser..