Eterna Caliber 3901A
Factory specs
- Caliber
- 3901A
- Made in
- Switzerland
- Frequency
- 28,800 bph (4 Hz)
- Power reserve
- 65 h
- Jewels
- 29
- Hacking
- —
- Hand winding
- —
- Accuracy
- —
- Diameter
- —
- Height
- —
- Functions
- —
- Same family
- Eterna Caliber 3907M, Eterna Caliber 3916M
An automatic of Eterna's modular Caliber 39 family (introduced 2006, per Vivir), with a ball-bearing rotor. S.U.F Helsinki's Vetehinen MK I page gives 28,800 vph, 29 jewels, 65h and hours, minutes and small seconds for the 3901A; Vivir's Eterna Eternity review gives the same frequency, jewels and power reserve and calls it an automatic with a date function. Because the two sources describe its displays differently, `functions` is left out; the watches using it record what they show. Eterna publishes no public data sheet for it, so diameter, height, hacking and hand winding are not recorded.
Watches with the Eterna Caliber 3901A
| Watch | Price from | Movement | Dia. mm | Thick mm | Crystal | Micro-adjust |
|---|---|---|---|---|---|---|
 S.U.F Helsinki Vetehinen MK I |
$4,209 | Eterna Caliber 3901A | 42 | 13 | Sapphire | — |