Bizarrely, the first publication/information about this gun after its initial commercial failure came in 1953 - in a porn magazine!
The article gets quite a few details wrong, but is a great historical touchstone for seeing how quickly they were treated as curios.
The Becker Automatic Revolving Shotgun
Designed in early 1920s Germany by August Coenders, it uses a novel blow-forward action to facilitate cocking, cylinder rotation, and ejection of fired shells - 16 gauge, 65mm shells.