Porthole Disc Dial
Futurematic E 501 — Porthole Disc Dial
Undated
Later edition replacing the hands with rotating discs: the power-reserve disc turns from red or blue (full) to white (low), and seconds are shown by an arrow disc.
Identifying details
- Power reserve indicator
Display of the remaining power reserve.
- Back-set crown
No winding crown; time set by a flat crown on the caseback.
Variants of E 501
Reference overview →| Variant | Production |
|---|---|
| Porthole Disc DialCurrent | Undated |
| Steel | Undated |
| Steel · Steel, Black Dial | Undated |
| 18K Yellow Gold (Jaeger-LeCoultre) | Undated |
Case & movement
- Reference
- E 501
- Production
- Undated
- Case diameter
- 35 mm
- Movement
- Automatic
- Date
- No
Dial, bezel & hands
Unknown attributes are left out rather than guessed.