Sigma Dial
Day-Date 1803 — Sigma Dial
c. 1971–c. 1972
Sigma symbols either side of “T Swiss T” at 6, used briefly in the early 1970s to signal solid gold dial parts. Dated examples: white gold with black dial and five diamonds, case 2'750'497, 1971; a 1972 1807 with Spanish day wheel.
No verified image of this watch yet
Identifying details
- Day of the week
Day of the week spelled out in a window, usually at 12 o’clock.
- Sigma dial
Two σ symbols either side of “T Swiss T”, indicating gold hour markers and hands.
- Date
Date display.
- Cyclops
Magnifying lens over the date.
Variants of 1803
Reference overview →| Variant | Production |
|---|---|
| Standard Pie-Pan Dial | Undated |
| Stella Lacquer Dial | Undated |
| Stella Lacquer Dial · Yellow | Undated |
| Stella Lacquer Dial · Coral | Undated |
Case & movement
- Reference
- 1803
- Production
- c. 1971–c. 1972
- Case diameter
- 36 mm
- Water resistance
- 50 m
- Crystal
- Acrylic
- Movement
- Automatic
- Date
- Yes
- Caliber
- Rolex 1556
Dial, bezel & hands
- Text at 6
Movement
Rolex 1556
Later 1800-series Day-Date caliber, used to the end of the 1803; still no quickset for day or date. Phillips notes a hacking seconds stop on late examples.
Automatic · 26 jewels