List the components
A movement listing does not necessarily describe a complete clock. Ask whether dial, hands, weights, pendulum, striking components and accessories are included. Request views from the front, side and back. A written inventory gives you a practical way to compare what was offered with what arrives.
Define the intended project
If the movement is to go into an existing case, record the available dimensions and mounting points. Visual similarity does not establish mechanical compatibility. Send the information to the clockmaker who will undertake the work. If the project is decorative only, specify that purpose instead of describing the resulting assembly as a functioning clock.
Prepare for service and transport
Ask about known work and what has actually been tested. A video cannot establish reliable operation over time. Agree how loose and fragile elements will be immobilised and packed, and photograph the assembly before dismantling. Keep identifiable parts together in the record so the receiving professional can assess the complete proposal rather than a box of undocumented components.
For the next part of your selection, read Antique French mantel clocks: case, movement and placement.