These are German bikes which were sold in the UK in the 1990s and early 2000s in some department stores and garden centres. Yours looks like it's demountable - it can be split into two. No idea why anyone would want to do that.
I had one of these, given to me by the owner's widow, which I passed on to someone who needed a bike to get to work. It was heavy, but reliable.
I think you'd struggle to sell it in today's market.