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Rolex 1220
Manual · 10.5‴ · Switzerland · 1954
Dimensions
23.69 mm
Height
4.30mm
Jewels
17
Power reserve
58h
Timegrapher
Beat rate
21,600bph
Frequency
3Hz
Lift angle
52°
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.
|
| Shock protection |
KIF
A family of Swiss shock protection systems (Trior, Flector, Elastor, Duofix, Protechoc) produced by Parechoc SA, the main competitor to Incabloc. Uses a multi-point elastic spring design (typically three points in the Trior version) that excels in thinner calibres. Long favoured by Rolex (Duofix), Patek Philippe, and Audemars Piguet before each developed proprietary systems.
|
Specifications
| Lignes | 10.5‴ |
|---|---|
| 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 | 1.30 x 0.85 x 0.20mm |
| Further measures | Mounting Diameter (Dm): 23.3mm |
Origin & References
| Manufacturer | Rolex |
|---|---|
| Country | Switzerland |
| Launch year | 1954 |
| COSC certified | No |
| Signature | 1973: RB, 1225, Montres Rolex S.A., Geneva Swiss, 17 Jewels; Kif-Ultraflex |
| US import codes |
|
Notes
Remarks: escapement wheel in Kif-Duofix combined settings
adjustment weights on balance spokes
assembly for fine adustment with normal screw driver
commonly signed: 1225
Other data: balance staff: U3342 stem: W2815 stem ronda: 2014 (10,5)
adjustment weights on balance spokes
assembly for fine adustment with normal screw driver
commonly signed: 1225
Other data: balance staff: U3342 stem: W2815 stem ronda: 2014 (10,5)
Family
Series 1200 - 1225
18000 A/h:
1200: sub second
1210: sweep second
1215: sweep second, date
21600 A/h:
1220: sweep second
1225: sweep second, date
1200: sub second
1210: sweep second
1215: sweep second, date
21600 A/h:
1220: sweep second
1225: sweep second, date
Related calibers
Rolex 1200
Rolex 1210
Rolex 1215
Rolex 1220
Rolex 1225
Compatible Parts
266 other catalog sources can supply compatible parts for this caliber.
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