====== Lemania 2310 ======
**Calibre 2310** was a popular [[chronograph]] movement from [[Lemania]].

===== Overview =====
In the 1940's, Lemania and [[Omega]] worked together on a project called "27 CHRO C12" to develop a 27 mm diameter chronograph with a 12-hour register. Lead by Albert Piguet and Jaques Reymond, this project resulted in the [[1942]] launch of the **Lemania 2310**, called **Calibre 321** by Omega.

Cal. 2310 was a [[column wheel]] design with a [[screwed balance]] oscillating at 18,000 A/h. It has a distinctive "wishbone" shaped bridge that makes it recognizable to many.

This movement was famously used in the [[Omega Speedmaster]] from [[1957]] through [[1965]] as well as the [[Omega Speedmaster Professional]] from [[1965]] through [[1968]], where it gained fame as the "moon watch" movement. It was also used in the [[Omega DeVille]], [[Omega Seamaster]], and watches from [[Patek Philippe]] (as Cal. 2872).

The [[cam switching]] [[Lemania 1872]] family replaced the 2310 for most applications beginning in [[1968]].

===== Calibre 2320 =====
The **Lemania 2320** was closely related but included a [[swan neck regulator]], 4 extra jewels (21 total), and other refinements.

===== Omega Relaunch =====
In [[2019]] it was announced that [[Omega]] had been working in secret to re-create the classic Cal. 321 with modern technologies. The so-called "Alaska 11" project would create a new [[Omega Speedmaster]] watch for the 50th anniversary of the Apollo 11 moon landing.

===== Variants =====
Calibres 2310 and 2320 are used as the [[ebauche]] and base design for the many prized chronograph movements from names like [[Patek Philippe]], [[Vacheron Constantin]], [[Breguet]], and [[Roger Dubuis]]. It is widely regarded as one of the finest such movement designs in history.

  * Lemania 2310 variants
    * Patek Philippe 2872
    * [[PP CH 27-70|Patek Philippe CH 27-70]]
    * Omega 321
  * Lemania 2320 variants
    * Vacheron Constantin 1141, 141, and 141q
    * [[PP CH 27-70|Patek Philippe CH 27-70Q]]
    * Breguet 533.2


{{tag>Movements Manual_winding_movements Lemania_calibres Chronograph_movements Column_wheel_chronograph_movements}}