What horn did H. Ford put on the model A?

[Electrocutioner]

I looked VIA search and couldn't find this answer here. I have a friend that owns multiple model T's and argues that any original horn would have "Ford" stamped into it. This argument started because I recently bought a brand-new Spartan horn from Snyders and he says that it is a reproduction of something that was never actually on the vehicle. Now my curiosity is up, is Spartan a popular aftermarket horn or is my Spartan a reproduction of the original horn on the car?