Non-Pillar Wheel Chronograph Nomenclature
Guide to Standard Swiss Part Numbers
| 8000 Chronograph Runner, Mounted | 8219 Hammer |
| 8020 Minute Recording Runner, 30 Min. | 8270 Minute Recording Jumper |
| 8060 Driving Wheel | 8290 Friction Spring |
| 8080 Coupling Clutch, Mounted | 8320 Coupling Clutch Spring |
| 8100 Sliding Gear, Mounted, 30 Min. | 8325 Sliding Gear Spring |
| 8139 Operating Lever | 8340 Fly-back Lever Spring |
| 8180 Fly-back Lever | 8350 Hammer Spring |