The very top of the clock in the photo of the case is cut off so it can't be seen. We need another photo showing the whole clock case to include the top ornament. There are a couple that are similar and we need to determine which you have. It could be the Seine from 1894 but I'm not sure.
Throw the mainsprings away and remove the remainder of the rust from the movement and it will make a nice clock. A lot of work but there is potential there. The pendulum is one of the standard straight Ansonia ones. The suspension spring is probably just the one with the straight wire formed into a hook for the pendulum.