Red Depth Rating
Explorer 6610 — Red Depth Rating
1955–1956
Earliest 6610s with a small red “50m = 165ft” depth rating printed below “Explorer” in the upper dial; removed on later examples. Elongated gilt Mercedes hands.
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Identifying details
- OCC dial
Reads “Officially Certified Chronometer”.
- Explorer dial
Arabic 3, 6 and 9 hour markers.
- Red depth rating
Depth rating printed in red.
Variants of 6610
Reference overview →| Variant | Production |
|---|---|
| Red Depth RatingCurrent | 1955–1956 |
| Gilt Depth Rating | c. 1956 |
| Large Lollipop Seconds | c. 1957 |
| Small Lollipop Seconds | c. 1959 |
Case & movement
- Reference
- 6610
- Production
- 1955–1956
- Case serials
- c. 113,000–114,999
- Case material
- Stainless steel
- Case diameter
- 36 mm
- Crown guards
- None
- Water resistance
- 50 m
- Crystal
- Acrylic
More specifications (4)
- Movement
- Automatic
Movement
Rolex 1030
Slim automatic that replaced the bubbleback calibers in the Submariner, allowing a flatter caseback. Also used in Explorer and Oyster Perpetual models.
Automatic · Introduced 1950 · 18,000 vph · 25 jewels · 5.85 mm thick