Yellow Gold
Ingenieur 666 A — Yellow Gold
Undated
18k yellow gold 666 A, made in far smaller numbers than steel; documented with calibre 853.
Identifying details
- Ingenieur lightning-bolt logo
“Ingenieur” script with the lightning-bolt emblem on the lower dial.
- Soft-iron inner case
Soft-iron inner case and dial forming a cage that shields the movement from magnetic fields.
Variants of 666 A
Reference overview →| Variant | Production |
|---|---|
| Calibre 852, Steel | 1955–1958 |
| Calibre 853, Steel | 1958–1963 |
| Yellow GoldCurrent | Undated |
| Special Order Nude Dial (1965) | 1965 |
Case & movement
- Reference
- 666 A
- Production
- Undated
- Case material
- 18k yellow gold
- Case diameter
- 36.5 mm
- Water resistance
- 100 m
- Crystal
- Acrylic (Plexiglas)
- Movement
- Automatic
- Date
- No
More specifications (1)
- Caliber
Movement
IWC 853
Refined 852 with improved balance and barrel; made until 1963. With the date version 8531, 140,400 were produced.
Automatic · Introduced 1958 · 19,800 vph · 21 jewels