Rolex [Caliber 720] - Mainspring - 4000

The base item Rolex [Caliber 720] - Mainspring - 4000 carries the part list number 4000 specifically for spare parts search for Caliber 720.

The parts list clearly assigns this part to the caliber. The technical reference image serves for traceable identification during service, repair, and spare parts search.

For verification, Caliber 720, part number 4000, and the designation mainspring are matched together.

Later variants show the available original part, the documented condition, and the actual delivery contents.