| Model | Must Tank SM Black Roman with International eternal permanent guarantee card |
| Reference | 3 |
| Year of Production | 1980's |
| Movement | Manual winding (Cal.78-1) |
| Country of Origin | Switzerland |
| Water Resistance | non-waterproof |
| Case Diameter | 28mm×21mm |
| Case Material | Vermeil |
| Crystal | mineral glass |
| Lug Width | 15mm |
| Buckle Width | 14mm |