Fortis B-47 CALCULATOR
| Brand | Fortis |
| Name | B-47 CALCULATOR |
| Reference | 669.10.31 |
| Diameter | 47 mm |
| Material | Stainless Steel Case, Leather Strap |
| Features | Countdown, Date, GMT, Water resistant ≥ 600 ft, Internal rotating bezel |
| Movement | Automatic Self-Winding Mechanical |
