| Model | Santos Octagon SM / 18K YG x SS Quartz |
| Reference | 187903 |
| Year of Production | 1980's |
| Movement | Quartz (battery operated Cal.687) |
| Country of Origin | Switzerland |
| Water Resistance | Daily life waterproof |
| Case Diameter | 25mm |
| Case Material | 18k yellow gold x stainless steel |
| Crystal | mineral glass |
| Lug Width | 12mm |
| Buckle Width | 11mm |