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OMEGA SPEEDMASTER SUS MOVIMIENTOS
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 Modificada el 16/06/2009

The c.321 (a.k.a. Lemania 2310/2320):
 
The c.321 is based on a design development project titled "27 CHRO C12" (27 mm diameter, chronograph, with extra 12-hour register) took place in the 1940's by Albert Piguet and Jaques Reymond as a joint developement project between Omega and Lemania.  Launched in 1942, the 27 CHRO C12 later became known as the Lemania 2310, or Omega c.321).
It was used not only in the Omega Speedmaster from 1957 through middle 1965 but also the renamed and re-cased Omega Speedmaster Professional from middle 1965 through middle October 1968, but also in DeVille, Seamaster and non-model marked chronographs during this era. It also was used in Omega non-model marked Chronographs earlier in the 1950's under the 27 CHRO C12 calibre name...
The c.861 family (a.k.a. Lemania 187x family)...
The c.861 was developed by Lemania starting in 1965. As nothing is created in a vacuum, the Lemania 2310 was likely used as a starting point for the development of the new calibre...
Changes from the Lemania 2310/Omega c.321 to the c.861 included:
  1. The chronograph function was simplified from column wheel to a Shuttle/Cam system.
  2. The balance wheel was changed from a screwed balance to a smooth balance
  3. This allowed an increase in the frequency from 18,000 bph (2.5 HZ) to 21,600 bph (3 HZ)
  4. A flat balance spring was utilized...
  5. Another change was made to the shape of the bridge from it's previous "Arched", "Wishbone" or "Y" shape to a Trapezoidal shape... 
The revised movement was accepted for use by Omega, who started equipping Speedmasters in the October/November 1968 timeframe. The revised movement is known as the Lemania 1873 or Omega 861.
Here is a couple of pictures that I have modified to illustrate the main ways to distinguish between these two movements:
   
Distinguishing between c.321 and a c.86x based movements...

Omega c.321 (Lemania c.2310) movement

Omega c.1863 (Lemania c.1873) movement

Note: This movement is actually a c.1863 (see below)
   
     
Since the introduction of the c.861 there have been a few changes to the basic movement. However, there is a reason why I call this movement the "c.861 family"...
A listing of calibre's related to the c.861 that Omega has produced through the years...
 
c.863: Starting with a comemorative edition in 1980 marking the 10th anniversary of the Apollo 11 lunar landing Omega used a highly decorated version of the c.863 movement with Côtes de Genéve on the bridge in conjunction with a special crystal display back to show off the movement. In 1987 the Display back model became part of the product line. Current Display Back models use the Rhodium plated c.1863 movement (see below)...
c.864: A special chronometre grade version of the base c.861 movement has been made available for limited production runs for commemorative models off and on from 1992 through 1994 (at least).
c.866: A moonphase calendar complication version of the base c.861 has been produced for a special production run of 2,000 in 1985. Omega recently sold a white gold/white dial version of the moonphase and currently has a stainless steel/white dial version, both of which use the new Rhodium (c.1866) version of the c.866 movement.
c.867: A specially prepared hand made version of the c.861 made in 1994, that is a full-skeleton version of the c.861 created to commemorate the 50th anniversary of the hand-wound chronograph movement. Production was limited to 50 units...
From Gilt to Rhodium...
Starting in 1997 Omega changed the content of the movements it has put into the Speedmaster Professionals in two immediately noticeable and significant ways...
The movement was plated in Pink gold to begin with, then yellow-gold from 1992, then rhodium-plated in 1996. In 1996 the movement was renamed and re-launched as the c.1861 and is still manufactured today. A single part was changed from a metal component to a nylon-like synthetic part which wears better and is self-lubricating in all calibres except the display back model, with it the original metal part is retained because Omega didn't want display-back owners seeing the synthetic part. Additionally, a single additional jewel has been added bringing up the jewel count up to 18 from the 17 in previous calibres. To differentiate earlier gilt movements from Rhodium ones, Omega calls the Rhodium versions c.186x... So the Rhodium version of the c.861 is called the c.1861, the c.863 is called the c.1863, the c.866 is called the c.1866, and so on...
To see the difference between these two different generations of movement examine this side by side pictoral:
c.863 Display Back

c.1863 Display Back
Palabras Clave: Omega | Speedmaster | Sus | Movimientos
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