While you wait for answers, we may have found some information which could help you.
Click here for Hole Mantel Clock
Wirecutterman - Can you help again with my Smiths Oxford mantle clock?
My chiming mantle clock strikes too early?
Where is the slow/fast regulator on a Smiths Mantle clock? ?
can i fix the movement spring ?
How do I make the chiming mechanism work?
Smiths western chiming clock?