With one more picture of the back side of the handle I could tell you 100%. The difference for the Roman from the other pumps is it did not have a lock tab. The auction says this one is "missing" but I'm guessing he just doesn't know the difference. Other possibility is the tab broke off at some point and someone ground it flat. But my gut says Roman.
Seller posted additional pictures and now I'm not positive its for a Roman. Looks like someone might have done some repair work on the back side of the handle just where the lock tab would have been...but it also might be just a casting imperfection. I just can't say for sure based on those photos.