Omega Speedmaster Lug Widths
| Reference Number | Model | Lug Width |
| 304.XX.XX.XX.XX.XXX | Speedmaster Moonphase | 21mm |
| 311.30.44.50.01.001 | Speedmaster Professional | 22mm |
| 311.XX.XX.XX.XX.XXX | Speedmaster Moonwatch | 21mm |
| 3XX.XX.XX.XX.XX.XXX | Dark Side Of The Moon | 21mm |
| 3113.XX.XX/3123.XX.XX | Speedmaster Date | 18mm |
| 315X.XX.XX/355X.XX.XX | Broad Arrow | 20mm |
| 321.XX.42.XX.XX.XXX | Broad Arrow | 20mm |
| 321.XX.44.XX.XX.XXX | Broad Arrow | 21mm |
| 329.XX.XX.XX.XX.XXX | Speedmaster Chronoscope | 21mm |
| 358X.XX.XX | Broad Arrow | 21mm |
| 365X.XX.XX/385X.XX.XX | Broad Arrow | 20mm |
| 321.10.XX.XX.XX.XXX | Speedmaster Olympic | 20mm |
| 321.30.44.XX.XX.XXX | Speedmaster Olympic | 22mm |
| 321.32.44.XX.XX.XXX | Speedmaster Olympic | 21mm |
| 321.30.94.XX.XX.XXX | Speedmaster HB-SIA | 22mm |
| 321X.XX.XX/322X.XX.XX | Speedmaster Date | 19mm |
| 323.XX.XX.XX.XX.XXX | Speedmaster Date | 19mm |
| 324.XX.XX.XX.XX.XXX | Speedmaster Date 38 | 18mm |
| 326.XX.XX.XX.XX.XXX | Speedmaster Racing | 19mm |
| 327.XX.XX.XX.XX.XXX | Speedmaster Mark II | 20mm |
| 329.XX.XX.XX.XX.XXX | Speedmaster Racing | 21mm |
| 33X.XX.XX.XX.XX.XXX | Speedmaster 57' | 20mm |
| 350X.XX.XX | Michael Schumacher | 20mm |
| 351X.XX.XX | Speedmaster Date 38 | 18mm |
| 35XX.XX.XX/38XX.XX.XX | Speedmaster Reduced | 18mm |
