Compare Studio
CK2915 vs 105.012
Differences are highlighted. Rows where both references share a value are dimmed.
| Specification | ||
|---|---|---|
| Nickname | Broad Arrow | — |
| Production | 1957–1959 | 1964–1968 |
| Era | First Speedmaster | First 'Professional' |
| Status | discontinued | discontinued |
| Case diameter | 39mm | 42mm |
| Case material | Stainless steel | Stainless steel |
| Construction | — | Asymmetric crown-guard case |
| Bezel | Tachymeter | Tachymeter |
| Bezel material | Steel (later aluminium) | Black aluminium |
| Crystal | Acrylic (Hesalite) | Acrylic (Hesalite) |
| Caseback type | Screw-down solid | — |
| Water resistance | 60m | 60m |
| Dial | Black | Black |
| Dial text | — | First to read 'Professional' |
| Hands | Broad arrow | Straight (baton) |
| Lume | Radium then tritium | Tritium |
| Lume type | Radium | Tritium |
| Movement | Manual chronograph | Manual chronograph |
| Caliber | 321 | 321 |
| Manufacturer | Omega (Lemania base) | Omega (Lemania base) |
| Winding | manual | manual |
| Frequency | 18,000 vph | — |
| Complications | Chronograph, tachymeter | Chronograph, tachymeter |
| Functions | Chronograph, tachymeter | — |
Compare CK2915 with another generation