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Omega 681
Automatic · 7.98‴ · Switzerland · 1961
Dimensions
18 mm
Height
5.30mm
Jewels
24
Power reserve
40h
Timegrapher
Beat rate
19,800bph
Frequency
2.75Hz
Lift angle
48°
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.
|
| Shock protection |
Incabloc
The most famous and widely used shock protection system in horology. Invented in 1934 by Georges Braunschweig and Fritz Marti at Universal Escapements (La Chaux-de-Fonds), it employs a lyre-shaped spring holding the jewel setting, allowing it to shift under impact and return to position. Adopted by countless Swiss makers across the 20th century.
|
Specifications
| Lignes | 7.98‴ |
|---|---|
| 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.
,
Date
An essential for many, the date display reminds wearers of their daily commitments, connecting the abstract concept of time to tangible daily events.
|
| Hand count | 3 |
| Hand sizes | 1.10 x 0.55 x 0.16mm |
| Further measures | Mounting Diameter (Dm): 17.5mm Stem height (T): 2.2mm Mounting Height (F): 1.8mm |
Origin & References
| Manufacturer | Omega |
|---|---|
| Country | Switzerland |
| Launch year | 1961 |
| COSC certified | No |
| Signature | 1966: 23399068, Omega Watch Co, Swiss, Adjusted 2 Positions, 24 Jewels; Incabloc |
| US import codes |
Notes
Remarks: 1961-1971
shares many parts with manual-wind family 620
Other data: balance staff: U2920 stem: W2935 stem ronda: 1538 Mainspring: 1.100 x 11.000 x 0.105 x 360.000 mm
shares many parts with manual-wind family 620
Other data: balance staff: U2920 stem: W2935 stem ronda: 1538 Mainspring: 1.100 x 11.000 x 0.105 x 360.000 mm
Family
Series 670 - 685
19800 A/h:
670: 17 jewels
670: 24 jewels
672: chronometer, 24 jewels
680: date, 17 jewels
681: date, 24 jewels
682: chronometer, date, 24 jewels
21600 A/h:
683: date, 17 jewels
684: date, 24 jewels
685: chronometer, date, 24 jewels
670: 17 jewels
670: 24 jewels
672: chronometer, 24 jewels
680: date, 17 jewels
681: date, 24 jewels
682: chronometer, date, 24 jewels
21600 A/h:
683: date, 17 jewels
684: date, 24 jewels
685: chronometer, date, 24 jewels
Related calibers
Omega 670
Omega 671
Omega 672
Omega 680
Omega 681
Omega 682
Omega 683
Omega 684
Omega 685
Compatible Parts
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