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Parrenin 64A
Manual · 11.5‴ · France · 1965
Dimensions
26 mm
Height
4.40mm
Jewels
17
Power reserve
39h
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 |
Pin Lever
Also known as the Roskopf escapement, this is a simplified, low-cost variant of the Swiss Lever using steel pins instead of jewelled pallet stones. Less accurate but inexpensive to produce, it democratized mechanical watchmaking in the 20th century, populating affordable alarm clocks and entry-level watches worldwide.
|
| 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 |
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.
|
| Hand count | 3 |
| Hand sizes | 1.40 x 0.90 x 0.215mm |
| Further measures | Mounting Diameter (Dm): 25.65mm Stem height (T): 2.2mm Mounting Height (F): 0.5mm |
Origin & References
| Manufacturer | Parrenin |
|---|---|
| Country | France |
| Launch year | 1965 |
| COSC certified | No |
| Signature | ca. 1965: - |
Notes
Remarks: pin-lever escapement
indirect minute, hand friction clutch on barrel (Roskopf type)
Other data: balance staff: U3055 stem: W3038 mainspring / battery: Zf607, 1.15 x 10.5 x 0.12 x 320mm balance staff ronda: 5269 (11,5) stem ronda: 1709 (11,5)
Ranfft mentioned about this caliber: There are variants with this quantity of jewels 1, 5, 14, 17
indirect minute, hand friction clutch on barrel (Roskopf type)
Other data: balance staff: U3055 stem: W3038 mainspring / battery: Zf607, 1.15 x 10.5 x 0.12 x 320mm balance staff ronda: 5269 (11,5) stem ronda: 1709 (11,5)
Ranfft mentioned about this caliber: There are variants with this quantity of jewels 1, 5, 14, 17
Family
Series 64 - C1641
without/with date respectively:
64/-- : 11.5" , sweep second
modified setting mechanism:
64A/64G: 11.5" , sweep second
click spring modified:
640D/641D: 11" , sweep second
1640/1641: 11.5" , no second
1640D/1641D: 11.5" , sweep second
--/1645: 11.5" , digital display
2640D/2641D: 12" , sweep second
3640D/3641D: 13.5" , sweep second
barrel arbor and ratchet wheel modified:
C1640/C1641: 11.5" , no second
64/-- : 11.5" , sweep second
modified setting mechanism:
64A/64G: 11.5" , sweep second
click spring modified:
640D/641D: 11" , sweep second
1640/1641: 11.5" , no second
1640D/1641D: 11.5" , sweep second
--/1645: 11.5" , digital display
2640D/2641D: 12" , sweep second
3640D/3641D: 13.5" , sweep second
barrel arbor and ratchet wheel modified:
C1640/C1641: 11.5" , no second
Related calibers
Parrenin 1640
Parrenin 1640D
Parrenin 1641
Parrenin 1641D
Parrenin 1645
Parrenin 2640D
Parrenin 2641D
Parrenin 3640D
Parrenin 3641D
Parrenin 64
Parrenin 640D
Parrenin 641D
Parrenin 64A
Parrenin 64G
Parrenin C1640
Parrenin C1641
Compatible Parts
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