Likely just an obscure Chinese department store bike from the late 80s. I’ve come across a handful throughout the years. I think they were kind of knockoffs of the huffy sigma. Too bad you are missing the front hubcaps. No matter what 80s stuff you can usually find a buyer if it’s complete and in general pretty good shape. I had a super z 3000 very similar with the hubcaps and I got $350 for it but it was very complete and pretty nice shape. Yours having missing hubcaps and chain guard you might be better off parting out on eBay since it does seem to be fairly unique with its patterns etc