I think selling it at $300-$400 would be fair. Chances are it's going to be a display piece for someone's pinball room. These very basic bagatelles are a dime-a-dozen so prewar collectors don't really care too much.
The main thing it has going for it is the casting around the playfield and the more ornate legs + side, so it would look super duper in someone's gameroom. This machine cost way more than many of the other bagatelles of the year prior, so if you're going to have one very basic bagatelle, this would be a good one to have.