The seller calls it “Batduck” (and in what’s probably a typo, “Butduck”), although the duck belonged to Batman’s nemesis, Penguin. It was Penguin’s ride of choice for the movie Batman Returns, and the seller claims that he has one of only seven ducks used in the film.
According to the seller, the duck is powered by an electric motor, and is capable of moving forwards and backwards. The wheel layout reminds me a lot of one of an amphibious 6×6 ATV, which would also make it ideal for traveling through Gotham City’s sewers.
The seller claims that the Spanish company he bought the duck from specializes in movie vehicles, and told him that it was used in the movie, but he doesn’t have any certification proving that.
At least one duck (or prop resembling the duck) was dubbed over with very cartoony, very Tim-Burton-y internal combustion engine sounds and blown to bits, so we at least know that this isn’t that one.