TECHNICAL SPECIFICATIONS

Omega 30 T2 (original movement)

Basic calibre: 

Diameter: 

Thickness: 

Power Reserve:

Number of jewels:

Frequency:

Hairspring:

Minute wheel:

Regulator: 

Crown wheel and core:


Ratchet wheel: 



Basic calibre: 


Diameter: 

Thickness: 

Power Reserve:

Number of jewels:

Frequency:

Hairspring:

Minute wheel:


Regulator: 

Crown wheel and core:


Ratchet wheel: 



30T2, nickel-plated, with copper-coloured going train

30 mm

4 mm

44 hours

15

18000 vph

Breguet overcoil

Finished interior arc and arms

No special finish

radial brushing, polished teeth

with wide concave black polished countersink, polished teeth, flat surface with radial brushing

Omega 265 - 30 T3 PC AM 15P (original movement)

Basic calibre: 


Diameter: 

Thickness: 

Power Reserve:

Number of jewels:

Frequency:

Hairspring:

Minute wheel:

Regulator: 

Crown wheel and core:

Ratchet wheel: 



Basic calibre: 





Diameter: 

Thickness: 

Power Reserve:

Number of jewels:

Frequency:

Hairspring:

Minute wheel:


Regulator: 

Crown wheel and core:


Ratchet wheel: 



Basic calibre: 





Diameter: 

Thickness: 

Power Reserve:

Number of jewels:

Frequency:

Hairspring:

Minute wheel:


Regulator: 

Crown wheel and core:


Ratchet wheel: 



265 (30 T3 PC AM 15P), nickel-plated, with copper-coloured going train, antimagnetic, shock-protection

30 mm

4 mm

45 hours

15

18000 vph

Breguet overcoil

Finished interior arc and arms

No special finish

radial brushing, polished teeth

with wide concave black polished countersink, polished teeth, flat surface with radial brushing

Omega 266 - 30 T3 PC AM 17P (original movement)

Basic calibre: 


Diameter: 

Thickness: 

Power Reserve:

Number of jewels:

Frequency:

Hairspring:

Minute wheel:

Regulator: 

Crown wheel and core:

Ratchet wheel: 



Basic calibre: 





Diameter: 

Thickness: 

Power Reserve:

Number of jewels:

Frequency:

Hairspring:

Minute wheel:


Regulator: 

Crown wheel and core:


Ratchet wheel: 



266 (30 T3 PC AM 17P), nickel-plated, with copper-coloured going train, antimagnetic, shock-protection

30 mm

4 mm

45 hours

17

18000 vph

Breguet overcoil

Finished interior arc and arms

No special finish

radial brushing, polished teeth

with wide concave black polished countersink, polished teeth, flat surface with radial brushing

Omega 267 - 30 T4 PC AM 17P (original movement)

Basic calibre: 


Diameter: 

Thickness: 

Power Reserve:

Number of jewels:

Frequency:

Hairspring:

Minute wheel:

Regulator: 

Crown wheel and core:

Ratchet wheel: 



267 (30 T4 PC AM 17P), nickel-plated, with copper-coloured going train, antimagnetic, shock-protection

30 mm

4 mm

45 hours

17

18000 vph

Breguet overcoil

Finished interior arc and arms

No special finish

radial brushing, polished teeth

with wide concave black polished countersink, polished teeth, flat surface with radial brushing

Omega 30 T2 refinished by Christian Etienne

Each new old stock caliber starts off with a complete disassembly and cleaning, after which each part is quality controlled. Any parts that might not be in perfect condition, such as the winding spring, are replaced with new old stock original parts where needed.


The baseplate is lapped and rhodium plated in order to bring light into the movement, this provides wonderful visual depth and forms an attractive contrast to the lapped, polished and satin finished bridges and parts treated in 5N rose gold as seen from the movement back. The hand blued regulator and movement screws add an elegant finishing touch to the visual impression of the whole.


The crown and ratchet wheel are radially brushed and the ratchet is then laser engraved with the C-E logo and the click is given polished edges and anglage.


The result of this work is a legendary vintage movement reborn, prepared and ready for the 21st century and a lifetime of use.

History of the famed 30 mm OMEGA caliber 

Thanks to its exceptional reliability, its adjustment performance, its robustness and its ease of maintenance, this legendary caliber was a landmark in the industrial history of watchmaking for a quarter of a century, from 1939 to 1963. In terms of its chronometric results it will even be the talk of the town until 1967, the last year of the competitions where, thanks to its incredible precision, it reigns as an almost absolute master since its first introduction


Built in December 1938, with a diameter of 30mm and thickness of 5.10 mm the caliber uses a traditional frequency of 18,000 vph. Later, with its central seconds hand brother born in 1940, with a slightly larger thickness of 5.40 mm, the number of calibers produced will grow and multiply to nearly 3 million specimens up to 1963.


In homage to an unknown genius: The most astonishing thing about the genesis of this masterpiece of time measurement is that its genius builder, the modest and discreet Henri Kneuss, deputy technical director (assistant to Henri Gerber), is a self-taught man who has never attended any watchmaking school. His project is submitted by Paul Brandt to Otto Ahrens, the watchmaker from Lucerne, who is his "external technical advisor", with the prototype made by Jean-Pierre Matthey-Claudet. Ahrens was at first not 100% convinced of the caliber’s initial design, given the relative weakness of its mainspring compared to the size of its balance-spring. But this defect was quickly corrected with the advent of the first much more powerful, unbreakable mainspring. 


The reference of the caliber will be engraved on the plate, near the location of the balance wheel, until 1949, later on the barrel bridge, next to the crown wheel.


Here is a table taken from Marco Richon's 1998 book, "Omega Saga” from 1998

An early version, the 30 T1 of 1939

A superlative caliber: Its theory and practice of construction, all in perfect balance, is based on experience (probably those of precision setters). The bimetallic screw balance and the steel balance spring with Breguet curve. This balance will be improved throughout its existence to take into account the latest advances in watchmaking technology. It was the first of the brand to be equipped with the Incabloc shock protection in 1942. Its running results remain exceptional even after years of use and lack of proper lubrication! It makes the T 30 the preferred caliber of watchmakers: simpler, more solid, more durable, more reliable and more precise than all the others in this caliber size segment.


Launched in 1939, it was immediately adopted by the British army. Omega delivered 110 000 watches to the British Army, Navy and Air Force during WW II, making this watch one in two of every timepiece supplied to them by by Swiss watchmakers. The case and bezel are made of avional (or duralumin, a light alloy of aluminum, copper, magnesium and manganese), and the case back is made of stainless steel.


This 30mm caliber with its technical evolutions has been used in many well-known Omega models. Take for example the Teddington model developed for the Brazilian market or the Suveran model for the Swedish market. The Ranchero model of 1956, Railmaster of 1957 and of course the Seamaster of 1962 are only a few of many other examples.


From the number 11'600'000 in 1949, the T 30 will be followed by the caliber 260 and several derivatives based on its inimitable foundation.


Examples of the chronometer versions with "luxury finishing” are the caliber 30T2 RG, the 262 of 1943 and the 30 SC RG, then later the 281 with central seconds in 1943. These versions have a higher degree of finishing than the other calibers, with an angled and polished anchor, as well as changes in the winding system, the wheels and the addition of a fine timing adjustment system.


In 1941, Omega launches its chronometer caliber the 30 T2 movement, which retains its nickel-plated movement finish for the first models.


Secrets of the 30 mm base caliber


The outstanding performance won in precision timing competitions makes the 30mm the most accurate wristwatch caliber ever tested by observatories. In the wake of the record being broken three times at Kew Teddington in 1946, Omega-Information 5, of June 1947, asks the following questions: 


What are the causes that make the 30mm caliber so to speak so invincible, and what is the practical utility of observatory competitions?


Henri Gerber provided the following answers: 


“A first observation is necessary: contrary to what one could believe, the 30mm caliber, used with the successes that you know is the same one that is made in large series since 1939. The in-depth study that preceded its creation focused more specifically on the application of the basic principles – so to say the golden rules of watchmaking - officially recognized in precision watchmaking. This preliminary study allowed a design with parts of ideal proportions, to which the caliber owes its exceptional regularity of running. This is how, for example:


- that the surface area of the barrel and the balance wheel is extended to the extreme limit ensuring maximum regulating power; 


- that the best efficiency of the transmission of power has been exactly determined by the meticulous study of the dimensions of its gears; 


- finally, that the escapement has been chosen among the smallest measurements that can be adopted for a caliber of this size.


We could see from the beginning of its launch that this new caliber not only was extremely easy to adjust, it also "held" those adjustment in a remarkable way. This led to its participation in observatory competitions.


Competition grade watches were prepared in a special manner: In order to meet the requirements of the observatories, all competition calibers are given special care in the finishing of certain components: spring, barrel, escapement, balance wheel, balance spring and stones. All these improvements naturally cause a significant increase in the cost of manufacture and, for this reason, cannot be applied to mass-produced watches. 


Each of these steps contributes to the reduction of possible setting differences by a few fractions of a second. And similarly, this is how we manage to achieve, through fine improvements on a well-built serial caliber, performances such as those we have just mentioned.” 


Newsworthy: The 30mm has been the subject of numerous articles, quotations, references, mentions and other reports in the specialized press, as well as two books devoted solely to it.


Specialist books on the Omega 30mm caliber:


Omega Saga de Marco Richon, 1998, ISBN 2-88380-010-3

Omega de Marco Richon, voyage à travers le temps, 2007, ISBN 978-2-9700562-0-1

Omega 30 mm-authentisch ? de Heinz Hampel, Berlin 2018, ISBN 978-3-939315-71-1

Omega 30 mm chronometer de Erich Lexer, Lienz 2019, ISBN 978-3-200-06002-9


On Internet : http://squelettewatches.com/chronometres-30mm/

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