Antique French Portico or Columns Clock With Marquetry inlay by Japy Freres ca 1880’s

Hi, just purchased this antique French Portico/Columns Clock With Marquetry Inlay barley twist circa 1880 by Japy Freres I believe the wood to be Ebony with other inlay wood I purchased this clock as is (not working ) “bought cheap “ I’m unsure if the pendulum is original to the clock as I see others similar Clock of same or similar style with a different pendulum the movement is very dusty and dirty needing cleaning also I believe the suspension spring to me missing but don’t know what size or how to attach Directly with top pin any information you may want to share with me would be very much Appreciate it, thank you for reading/viewing, happy hunting/collecting