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ETA 1015
Manual · 11.5‴ · Switzerland · 1945
Dimensions
26 mm
Height
3.50mm
Jewels
17
Power reserve
41h
Timegrapher
Beat rate
18,000bph
Frequency
2.5Hz
Reference: healthy amplitude ≈ 270–315° fully wound (>200° at 24 h); beat error ideally < 0.5 ms.
Movement
| Movement type |
Manual
Purely mechanical movements wound by hand via the crown, which tensions the mainspring to store energy. As the spring unwinds, it drives the gear train at a controlled rate set by the escapement and balance. Typical power reserves range from 38 to 80 hours, requiring daily or near-daily winding to keep the watch running.
|
|---|---|
| Winding type |
Stem Winding (Crown)
Winding the mainspring by turning the crown attached to the stem, transmitting torque through the winding pinion. Patented by Adrien Philippe in 1842, it replaced key winding and remains the standard manual winding method for both pocket watches and wristwatches.
|
| Setting type |
Stem Set (Crown Pull)
The dominant modern system: pulling the crown out to a setting position engages the hand-setting mechanism. Introduced in the late 19th century and refined into multi-position crowns (date, time, GMT). Used in virtually all modern wristwatches and most 20th-century pocket watches.
|
| Escapement type |
Swiss Lever
The undisputed standard of modern mechanical watchmaking. Through an elegant interplay between escape wheel, pallet fork, and balance, it delivers reliable impulses with the safety of 'draw' to keep the lever locked. Refined since the 18th century, it powers almost every quality mechanical wristwatch made today.
|
| Control type |
Balance Wheel
The heart of mechanical timepieces, the balance wheel is an oscillating component that, together with the hairspring, forms a harmonic oscillator regulating the gear train's pace. Its steady back-and-forth motion ensures the even release of energy from the mainspring, governing the watch's accuracy.
|
| Regulator type |
Pinned Regulator (or Index Regulator)
The most traditional regulator, consisting of a movable index pointer fitted with two curb pins (or a pin and a boot) that embrace the hairspring. Sliding the index along its scale changes the spring's active length, adjusting the rate. Simple, reliable, and easy to service, it remains the workhorse standard across countless mechanical movements.
|
Specifications
| Lignes | 11.5‴ |
|---|---|
| Shape |
Round
It is the most common form that we can find.
|
| Complications |
Sub Second
A small seconds hand typically located on a sub-dial and is separate from the central hour and minute hands. Originating from early pocket watches where the main balance wheel drove the seconds hand, it offers an elegant way to track the passage of time without crowding the main display. It remains a testimony to the watch's mechanical precision and history.
,
Perpetual Calendar
An engineering masterpiece, it accounts for month variations and leap years. It's a testament to horological excellence, programmatically tracking the intricacies of the Gregorian calendar.
|
| Hand count | 3 |
| Hand sizes | 1.40 x 0.80 / 0.22mm |
| Further measures | Mounting Diameter (Dm): 25.6mm Stem height (T): 1.7mm Mounting Height (F): 1.3mm |
Origin & References
| Manufacturer | ETA |
|---|---|
| Country | Switzerland |
| Launch year | 1945 |
| COSC certified | No |
| Signature | ca. 1945: 6, Swiss Made, 15 Jewels - ETA
(ETA 930) |
| US import codes |
|
Notes
Remarks: differences not known between 930, 931, 935, 937, 942, 973, 1015, 1016, 1018, 1024
likely just different bridge designs (cf. ETA 930)
Other data: balance staff: U3060 / U1424 hairspring collet 0.5mm/0.6mm stem: W832, W1161 mainspring / battery: Zf1269, 1.55 x 9.0 x 0.10 x 290mm balance staff ronda: 829 (10,5-11,5) stem ronda: 1 (11,5) Mainspring: 1.550 x 9.000 x 0.105 x 280.000 mm
Ranfft mentioned about this caliber: There are variants with this quantity of jewels 15, 17
likely just different bridge designs (cf. ETA 930)
Other data: balance staff: U3060 / U1424 hairspring collet 0.5mm/0.6mm stem: W832, W1161 mainspring / battery: Zf1269, 1.55 x 9.0 x 0.10 x 290mm balance staff ronda: 829 (10,5-11,5) stem ronda: 1 (11,5) Mainspring: 1.550 x 9.000 x 0.105 x 280.000 mm
Ranfft mentioned about this caliber: There are variants with this quantity of jewels 15, 17
Family
Series 900 - 932
900: 10.5" , sub second
901: 10.5" , sweep second
930: 11.5" , sub second
932: 11.5" , sweep second
901: 10.5" , sweep second
930: 11.5" , sub second
932: 11.5" , sweep second
Related calibers
ETA 1015
ETA 1016
ETA 1017
ETA 1018
ETA 1019
ETA 1024
ETA 900
ETA 901
ETA 902
ETA 903
ETA 927
ETA 928
ETA 929
ETA 930
ETA 931
ETA 932
ETA 935
ETA 936
ETA 937
ETA 938
ETA 939
ETA 941
ETA 942
ETA 968
ETA 973
Compatible Parts
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