| Price (USD) | 8160.00 - 10200.00 |
| Model | Q1378420 |
| Gender | Mens |
| Series | Master Ultra Thin Reserve de Marche |
| Movement | Automatic |
| Engine | JLC Caliber 938 |
| Case Materials | Stainless Steel |
| Case Shape | Rectangle |
| Case Diameter | 39 mm |
| Case Thickness | 10 mm |
| Case Back | Skeleton |
| Bezel | Fixed stainless steel |
| Dial Color | Silver |
| Dial Type | Analog |
| Dial Markers | Stick |
| Sub Dials | Small seconds sub-dial at the 6 o'clock position |
| Hands | Silver-tone |
| Bracelet | Black Alligator Leather |
| Clasp | Deployment with Push Button |
| Calendar | Date sub-dial |
| Water Resistant | 30 meters / 100 feet |
| Crystal | Scratch Resistant Sapphire |
