Rolex [Caliber 730] - Mainspring, medium strength 9.8/100 - 4200

The base item Rolex [Caliber 730] - Mainspring, medium strength 9.8/100 - 4200 carries the part list number 4200 specifically for spare parts search for Caliber 730.

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

For verification, Caliber 730, part number 4200, and the designation Mainspring, medium strength 9.8/100 are cross-checked together.

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