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| Movement | : | CO 503 |
| Winding system | : | Automatique |
| Functions | : | Minute • Hour • Second • Date • Month |
| Power reserve | : | 42 hours |
| Frequency | : | 4 Hz, 28'800 vph |
| Dimension | : | 11 1/2''' |
| Rubies | : | 21 |
| Movement finishes | : | Rotor with Corum dedicated decoration • 5N red gold-plated rotor for gold version |
| Case | : | Shape dodecagonal |
| Dimension | : | 42 mm |
| Thickness | : | 10.65 mm |
| Case material | : | 5N 18kt red gold / Stainless steel |
| Bezel material | : | 5N 18kt red gold / Stainless steel |
| Crown protector material | : | 5N 18kt red gold / Stainless steel |
| Crown material | : | 5N 18kt red gold / Stainless steel • Engraved Corum key |
| Crystal | : | Sapphire crystal with anti-reflective treatment |
| Back type | : | Screwed in sapphire open back with antireflective treatment |
| Water-resistance | : | 30 meters / 3 ATM |
| Distinctive features | : | Date corrector at 4 o'clock • Month corrector at 5 o'clock |
| Dial | : | Charcoal grey |
| Material | : | Brass |
| Distinctive features | : | Hourly nautical pennants transferred on the flange • Inscribed "Admiral's Cup" transferred on the dial • 5N red gold coated Corum logo applied on the dial • "Barleycorn" finishing • Applied 5N red gold-coated / steel hour indexes • 31-days-circle transferred on the dial |
| Hands | ||
| Hour and minute | : | Dauphine-variant • Faceted • 5N red gold coated / Rhodium-coated • Skeleton • White superluminova |
| Second | : | Baton with Corum key • 5N red gold coated / Rhodium-coated |
| Date | : | Baton • 5N red gold-coated / Rhodium-coated • Skeleton • White superluminova |
| Month | : | Dauphine • Faceted • 5N red gold-coated / Rhodium-coated |
| Bracelet | : | Crocodile leather |
| Colours | : | Black |
| Interhorn/Buckle | : | 21/18 mm |
| Buckle type | : | Tongue buckle / Triple folding clasp |
| Buckle material | : | 5N 18kt red gold / Stainless steel |
| Buckle distinctive features | : | Engraved Corum logo Opening and fastening system using 2 pushers for steel version |



