Pendulum clock - Marble, Wood - 1900-1910

The watch dates back to approximately the middle or the end of the 19th century, around 1870.
The case is made of black marble, probably Belgian black marble.
Features decorative inlays.
The dial has Roman numerals and original hands, with brass decorations on the upper part.
I assume that the side decorations have been removed.
It should be working, but we can't find the charging key. It sounds, but I don't know how often, and I don't know the charging time.
Need for some maintenance because there is rust in the mechanism.
This lot will be shipped via registered mail, or it can be picked up in Salerno city.