Eterna Caliber 3907M
Factory specs
- Caliber
- 3907M
- Made in
- Switzerland
- Frequency
- 28,800 bph (4 Hz)
- Power reserve
- 60 h
- Jewels
- 25
- Hacking
- —
- Hand winding
- Yes
- Accuracy
- —
- Diameter
- —
- Height
- —
- Functions
- Hours, Minutes, Small seconds, Chronograph
- Same family
- Eterna Caliber 3916M
The no-date version of the Eterna 3916M: a manually wound, column-wheel flyback chronograph of Eterna's modular Caliber 39 family, with a stacked register at 3 counting elapsed minutes and hours and running seconds at 9. Fratello (2021): apart from the missing date, the same specs as the 3916M (60h, 28,800 vph, column wheel, flyback), 25 jewels. Oak & Oscar says it is the only company using this caliber (in the Jackson Big Eye). Eterna publishes no public data sheet for it, so diameter, height and hacking are not recorded.
Watches with the Eterna Caliber 3907M
| Watch | Price from | Movement | Dia. mm | Thick mm | Crystal | Micro-adjust |
|---|---|---|---|---|---|---|
 Oak & Oscar Jackson Big Eye |
$3,150 | Eterna Caliber 3907M | 40 | 14.5 | Sapphire | no bracelet |