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Parrenin 1901
Automatic · 11.5‴ · France · 1960
Dimensions
26.35 mm
Height
7.00mm
Jewels
25
Power reserve
33h
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 |
Automatic
Mechanical movements fitted with an oscillating rotor that winds the mainspring through the wearer's natural motion. Invented by Abraham-Louis Perrelet around 1777 for pocket watches and adapted to the wristwatch by John Harwood in 1923, it combines traditional craftsmanship with everyday convenience.
|
|---|---|
| Winding type |
Automatic (Rotor-Driven)
Self-winding via a rotor whose motion winds the mainspring through a transmission gear train. The specific rotor configuration (central, micro, peripheral, bumper) is catalogued separately under Rotor Type. Standard on the vast majority of mechanical wristwatches since the mid-20th century.
|
| 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.
|
| Rotor type |
Central Rotor
The most common automatic winding rotor, mounted on the central axis of the movement and rotating a full 360°. Industrialized by Rolex with the Perpetual system in 1931 and refined throughout the 20th century, it offers excellent winding efficiency and remains the de facto standard for automatic wristwatches, whether winding in one or both directions.
|
Specifications
| Lignes | 11.5‴ |
|---|---|
| Shape |
Round
It is the most common form that we can find.
|
| Complications |
Sweep Second
Contrary to the ticking motion of quartz watches, the sweep second hand in mechanical watches moves smoothly around the dial, offering a visual representation of time flowing continuously. This has become synonymous with the precision and craft of mechanical horology.
,
Moon Phase
This artistic complication connects wearers to celestial rhythms. Depicting the lunar cycle, it's both a technical marvel and an aesthetic feature, bridging earthly timekeeping with cosmic patterns.
|
| Hand count | 3 |
| Hand sizes | 1.40 x 0.90 x 0.20mm |
| Further measures | Mounting Diameter (Dm): 26.05mm Stem height (T): 1.5mm Mounting Height (F): 0.9mm |
Origin & References
| Manufacturer | Parrenin |
|---|---|
| Country | France |
| Launch year | 1960 |
| COSC certified | No |
| Signature | ca. 1960: HP (Parrenin) 1901; Unisafe
(Parrenin 1901(CLD) without date parts) |
Notes
Remarks: jewel-bearing rotor
Other data: balance staff: U2115 stem: W2300 mainspring / battery: Zf1035, 1.40 x 10.0 x 0.10 x 350mm balance staff ronda: 4365 (11,5) stem ronda: 268 (10,5)
Other data: balance staff: U2115 stem: W2300 mainspring / battery: Zf1035, 1.40 x 10.0 x 0.10 x 350mm balance staff ronda: 4365 (11,5) stem ronda: 268 (10,5)
Family
Series 90 - 1901(CLD)
90: 10.5" , manual wind
90(CLD): 10.5" , manual wind, date
901: 11.5" , manual wind
901(CLD): 11.5" , manual wind, date
1901: 11.5" , automatic
1901(CLD): 11.5" , automatic, date
90(CLD): 10.5" , manual wind, date
901: 11.5" , manual wind
901(CLD): 11.5" , manual wind, date
1901: 11.5" , automatic
1901(CLD): 11.5" , automatic, date
Related calibers
Parrenin 1901
Parrenin 1901 (CLD)
Parrenin 90
Parrenin 90 (CLD)
Parrenin 901
Parrenin 901 (CLD)
Compatible Parts
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