Don't think anyone BUT Marlin made them. Just a discount version, the only discount is that it has a Birch, or hardwood stock in place of the Black Walnut. That feature made them cheaper, but not worse shooters. They are good guns.
Not sure about the 24" barrel, though, more than likely 20", but I could be wrong.
Not a terrible price, not knowing the condition or add ons makes it a WAG (Wild --- Guess) from here, though.