First the bad bit
It does not wind up. It is not seized. When you wind it, it feels as though there is nothing that it connects to. It just continues to feel free.

NOW THE GOOD NEWS ......AND THERE'S LOTS OF IT!

This is a Japy Freres of Paris movement that bears the back stamp of 'grande med d'honuer' which was awarded in 1855.
The pendulum, bezel, back plate and even the enamel dial bear the same serial number:- 13191, making it an original and complete item.
It came from a black slate mantle clock.
It has a 3 1/2" white enamel dial in very good condition.
Quality bevelled edged glass to the front.

Thanks for looking.