Louis Erard DayRetroPower
| Brand | Louis Erard |
| Name | DayRetroPower |
| Reference | 87 221 AA 01 |
| Diameter | 44 mm |
| Material | Stainless Steel Case, Leather Strap |
| Features | Date, Date Pointer, Day of the Week, Power Reserve Indicator, Central Seconds Hand, Retrograde, Water resistant to 100 ft |
| Movement | Automatic Self-Winding Mechanical |
| Price | About $3,116 France - about €2,250 |
