Omega Watches and their Movements


This is a database to give people an idea of what movements Omega has used over the years. The compilation of this list in ongoing... So, if you know of a movement that I haven't listed, please email me at oomegan@earthlink.net. with the caliber number, and what product line (Seamaster, Speedmaster, De Ville, etc.) the watch is in, and any other useful information.

Index:

Models:

Seamaster
Speedmaster
Constellations
De Villes
Dynamics
Miscellaneous
Chronometer Grade Movements
How a Bumper Wind Movement Works
Some side Notes on Some of the Movements
Omega and ETA/Lemania
Movements Through the Years
Automatic Movements and when they were Introduced

Seamasters

Watch

Caliber

Professional

1120

Professional Quartz

1438, 1538

Professional Chronograph

1154

GMT 

1128

Omegamatic

1400

Chronograph

1154

Ladies Quartz

1424

Vintage

342, 352, 353, 354, 420, 471, 500, 501, 550, 552, 562, 564, 565, 591, 601, 679, 720, 752

Vintage Chronograph

321, 861, 1040

Vintage Seamaster De Ville

550, 610, 711 

Electronic f300Hz

1250, 1255

600 

601

300

552, 565 

200

1002 

120

565, 1120 

60

565

30

267, 286, 269 

Cosmic

565, 1012

f300Hz 

1250

Polprof 

1002 


Speedmasters

Watch

Caliber

Professional

321, 861, 863,  864, 866, 867, 1040, 1861, 1863 

Professional Moon Phase

1866

Automatic

1040, 1045, 1140, 1141, 1151, 1152, 1155, 1160 

125

1041

X-33

1666 

Supersonic

1255 

Quartz  

1620


Constellations

Watch

Caliber

Automatic

1120

95 Quartz

1532

Perpetual Calendar

1680

Chronograph

Piguet 1270

Carre

1376

Ladies Small & Mini

1456

Ladies Automatic

2520

Vintage

354, 505, 551, 552, 560, 561, 562, 563, 564, 565, 751, 1001, 1011, 1012, 1310, 1330

f300Hz, and f2.4MHz

1250, 1255


De Villes

Watch

Caliber

Current Models

1120, 651, 1538, 1424

Co-axial 

2500

Prestige Chronograph

861 

Vintage

620, 661, 671, 684, 752 

Chronometer 300 Hz

1250 


Dynamics

Watch

Caliber

Chronograph

1138

1990s Version

1108

Vintage  

565


Miscellaneous

Watch

Caliber

Bumper Wind

28.10 RA PC (first automatic Omega), 333, 342, 343, 351, 354, 355 

Manual Wind

17.8-SC, 23.4, SC, 25.5 SOB, 26.5 S, 28, 231, 265, 266, 267, 268, 284, 269, 283, 286, 302, 600, 601, 611, 620 

Automatics

471, 563, 6101 RA, 562, 750 

30 mm Movements

265, 266, 269, 283, 284, 286

Museum Collection (5700.50.07) 

2200 

Flightmaster 

910 and 911 

Chronostop 

865

Megaquartz 

1310

Vintage Moon Phase

381

Ladies Vintage

11.5, 244, 482, 484, 485, 625, 671, 684 

Ladymatic

450 and 455

Tank Style Watches

T.17, P. 17.8, R 17.8, 19.4, 20.F, 27.3 S, 302, 671, 

Railmaster 

552

Globemaster

501

Aviator

35.5 S-T1

Century

283

Memomatic 

980

Geneve 

491, 552, 555, 601,  600, 601, 613, 1030, 1481

Grand Luxe

504

Chronograph

33,3 CHRO 

Chronoquartz 

1611

Pocket Watches

19''' LO, 38,5 Lépine T1, 140, 37.5 L-15 R, 37.5 T1 

Split Second Pocket Watch

1130 

Stop Watch

8260 A


 
Chronometer Grade Movements

For a watch to earn the title of "chronometer", the movement has to pass a very strict battery of test under very strict control at the most renowned official testing organization, the C.O.S.C (Controle Officiel Suisse des Chronometres). The testing last for 15 consecutive days. For the first ten days, the movements are tested in five positions at 20 degrees Centigrade. Three of the positions are vertical: 3 o'clock left, 3 o'clock up, and 3 o'clock down. Two test are horizontal: dial up and dial down.

After that, the movement is left in the horizontal, dial up position, and the temperature is lowered to 4 degrees Celsius for one day. Then it is raised back to 20 degrees Celsius for one day. Then the temperature is increased to 36 degrees Celsius. For the last two days of the test, the movement is moved back to vertical 3 o'clock left position and the temperature is lowered back to 20 degrees Celsius.

The timekeeping of the movement is recorded daily, and at the end of the 15 day test, calculations are made in six different areas. The different areas are:
1. mean daily rate in the different positions.
2. mean variation.
3. maximum variation.
4. greatest difference between the mean daily rate and any individual rate.
5. variation of rate per 1 degree Celsius.
6. resumption of rate.
The variances allowed are very small. The mean daily rate must be within -4 and +6 seconds per 24 hours. The only chronometer grade movements by Omega that I am aware of are: 28.10 RA, 331, 340, 354, 551, 560, 561, 562, 563, 564, 672, 682, 712, 864, 1001, 1011, 1021, 1041, f300Hz.
How a Bumper Wind Movement Works

Bumper wind,  a.k.a. hammer wind movements, are early automatics. In today's automatics, you have what is called a "full rotor" automatic. What this means, is that the rotor can go around the whole movement to wind the mainspring. But back in the early part of the 1900s, they didn't know how to make a full rotor automatic. The concept of the bumper wind came about in the 1920s by John Harwood. The rotor in a bumper wind swings around about 120-130 degrees. There were two draw backs to this movement, the first one is that it isn't the best system of winding. It takes a lot of wear to wind one completely. That's because the rotor, a.k.a. hammer mass, always wants to go in the direction of the mainspring. To compensate for this, watchmakers had to evenly place weights on the bottom part of the rotor. That way when the wearer moves their wrist, the rotor will be pulled away from the barrel bridge so that the watch could wind. The second is that the constant slamming of the rotor on to the winding bridge causes wear on the parts. The term "bumper wind" comes from the bump you feel when the rotor returns to the winding bridge.

Here is a picture of the movement in my Omega bumper wind:


Side Notes

Differences between the 28.10 RA PC and 28.10 RA SC PC was the center seconds of the 28.10RA SC PC.

The 342 was in the first Seamaster.  The 342 is identical to the 28.10 RA PC, but used concealed buffer springs. The 354 was identical to the 342, but used a swan neck regulator.  355 was the 354 with a date feature.

The 28.10 was a unidirectional wind.

The 501 is identical to the 471, but with swan neck regulator.

The 750 is a modified 550.

The 470 and 490 were the first Omega with rotor wind (360 degrees) winding bi-directionally.

471 was Omega's first full rotor automatic.

The first Constellation was introduced in 1952 with a Pie Pan dial, and 28.10 RA movement.

The base caliber in the Dynamic Chronograph is the ETA 2890-A2, and the chronograph movement is Dubois-Depraz 2030.

Besides adding a Geneve wave decor to the 1120 movement, and polishing the parts, Omega also adds their own winding rotor to the movement.
 


Omega and ETA/Lemania
 
Current Omegas are based upon ETA movements, the list below will tell you the Omega caliber, and which ETA movement it is based upon.

Omega Calibre

Lemania/ETA Base Movement Calibre

321

Lemania 2310 (Vintage) 2320 (current)

651

ETA/Peseux 7001 

725 

ETA 2000 

980 

Lemania 2980

1040, 1041

Lemania 1341 

861, 863 

Lemania 1873

1108, 1109, 1120, 1128, 2500 

ETA 2892-A2

1141 

ETA 2890-02 

1138 base caliber

ETA 2890-A2

1151 and 1152 

ETA (Valjoux) 7751

1154 

ETA (Valjoux) 7750 


Movements Through the Years

Here is a rough guide to when the watch movements were used by Omega. Please note, that if the a movement is not listed, it's because I couldn't verify when it was used. If you know of any that I haven't listed, please email me with the information.

Year

Movement

1910 

19''' LO 

1920 

19''' LO, 27,3 S, 

1930 

T-17, 25,5, 26.5, 26.5 S, 33.3 CHRO, 35.5 S-T1, 37.5 L-15 R 

1940 

37.5 T1, 38,5 Lépine T1, R 17.8, 20 F, 23.4 SC, 30-T2, 140, 265,  286, 333, 342 

1950 

P 17.8, 267, 268, 283, 285, 302, 321, 342, 352, 353, 354, 420, 471, 491 

1960 

268, 269, 286, 321, 482, 500, 501, 504, 505, 551, 552, 560, 561, 562, 563, 564, 565, 601, 611, 613, 861, 865, 1130 

1970 

552, 565, 613, 620, 661, 671, 684, 750, 751, 752, 861, 911, 980, 1002, 1011, 1040, 1045, 1250, 1310, 1330, 1350, 1352, 1510, 1611, 8260 A 

1980

861 and most quartz movements

1990 to present

651, 861, 1120, 1128, 1138,  1400, 1438, 1151, 1154, 1538, 1861, 1863 

Automatic Movements and when they were Introduced

Year

Movement

1943

28.10 RA PC, 30.10 RA PC, 330 

1945

28.10 RA SC PC

1947 

331

1949 

332, 351

1950 

343, 350, 352

1951 

353

1953 

344, 354, 355 

1955 

450, 455, 470, 471 (possibly 1956)

1956 

490, 491, 500, 501, 502, 503 

1957 

504, 505

1959

550, 551, 552, 560, 561, 562, 570, 571

1960 

590, 591, 592

1961 

593

1963 

660, 661, 670, 671,680, 681 

1966 

563, 564, 565, 710, 711

1967 

712, 750, 751, 752

1968 

672, 682

1969 

980, 1000, 1001, 1002 

1971 

683, 684, 685, 1040

1972 

1010, 1040

1973

1041

Statement of Rights:

The author maintains all rights. Reproduction of any kind is prohibited without permission form the author. You can contact the author at oomegan@earthlink.net.