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311.30.42.30.01.005 vs 105.012
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| Specification | ||
|---|---|---|
| Production | 2014–2021 | 1964–1968 |
| Era | Caliber 1861 (final) | First 'Professional' |
| Status | discontinued | discontinued |
| Case diameter | 42mm | 42mm |
| Case material | Stainless steel | Stainless steel |
| Construction | — | Asymmetric crown-guard case |
| Bezel | Tachymeter | Tachymeter |
| Bezel material | Black aluminium | Black aluminium |
| Crystal | Acrylic (Hesalite) | Acrylic (Hesalite) |
| Water resistance | 50m | 60m |
| Dial | Black | Black |
| Dial text | — | First to read 'Professional' |
| Hands | Straight (baton) | Straight (baton) |
| Lume | Super-LumiNova | Tritium |
| Lume type | Super-LumiNova | Tritium |
| Movement | Manual chronograph | Manual chronograph |
| Caliber | 1861 | 321 |
| Manufacturer | Omega (Lemania base) | Omega (Lemania base) |
| Winding | manual | manual |
| Complications | Chronograph, tachymeter | Chronograph, tachymeter |
| Bracelet | Steel | — |
Compare 311.30.42.30.01.005 with another generation