| Model | Must Tank LM Opalin |
| Reference | 590005 |
| Year of Production | 1990s |
| Movement | Quartz (Battery-powered Cal.90) |
| Country of Origin | Switzerland |
| Water Resistance | Not waterproof |
| Case Diameter | 30mm x 23mm |
| Case Material | Vermeil |
| Crystal | Mineral glass |
| Lug Width | 17mm |
| Buckle Width | 16mm |