None of the original wood was replaced. The decades of dirt were cleaned away by hand and the finish was restored using a combination of hand-rubbed oils.
The original bright/satin finish was restored and every brass and steel part. Every brass part was coated with hard, non-yellowing lacquer.
All of the work you see here was performed in my shop. This is just one example of the work I do.
Before....
Hamilton M22 Instrument in brass housing
Hamilton M22 box with brass gimbals
After...
Instrument serviced, box restored, brass polished and lacquered
Restoration complete with box open to the glass top for viewing
Close-up of refinished brass hardware