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Brand: | Lemania | 
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|---|---|---|---|
| Family: |
Unknown
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| Height: | 8.2 mm | ||
| Jewels: | 17 | ||
| Reserve: | 48 hours | ||
| Frequency: | 28,800 A/h | ||
| Winding: | Automatic, Central Rotor Automatic Winding | ||
| Diameter: | 31.00 mm (13.75 ligne) | ||
| Complications: | 2-Button, 24 Hour Hand, Bilingual Day Wheel, Cam Switching Chronograph, Chronograph, Date, Day, Hacking Seconds, Quick Date Correction | ||
| Hands: | 12 Hour Chronograph Hand at 6:00, 24 Hour Hand at 12:00, Central 60 Second Chronograph Hand, Central Chronograph Minute Hand, Central Hour Hand, Central Minute Hand, Date Window at 3:00, Day Window at 3:00, Small Seconds Hand at 9:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Central-Rotor Automatic  Clockwise Balance Cock  Triovis Regulator |
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| Production: 1978 – 2002 | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. 5100 is an automatic chronograph movement made by Lemania from 1978 through 2002. The central chronograph minutes hand was a distinctive feature, leading to a special following for watches using this movement. It was famously used by Omega, Sinn, and Tissot.
Lemania Cal. 5100 is a legendary workhorse of a movement, constructed from stamped steel, delrin plastic, and other simple materials. It was designed to compete with emerging inexpensive movements from Seiko and others, and to be cheap to assemble and service. It is an automatic chronograph like the contemporary Valjoux 7750 and features a similar “6-9-12” arrangement of subdials. One important difference is that the Lemania 5100 has chronograph minutes on the central axis along with chronograph seconds, giving watches using this movement a distinctive “four-handed” look.
The movement features a 12-hour chronograph counter at 6:00, small seconds at 9:00, and a 24-hour subdial at 12:00. One or more of these subdials are sometimes omitted, further differentiating watches that use this movement. Perhaps the most unusual Lemania 5100 watch is the Sinn EZM 1, with no subdials at all and the crown and pushers located on the left side of the dial.
The Lemania 5100 was quite successful, entering production just as Valjoux stopped producing the 7750 in the late 1970s, but fell out of favor as movement decoration became more important. Unlike competing movements, the Lemania 5100 was not suitable for display casebacks and did not adapt well to additional complications. Lemania’s new corporate parent, ETA, re-designed the more attractive and conventional predecessor Cal. 1340 as Cal. 1350 in 1994. ETA notified customers that production of Cal. 5100 would end in 1997, but they were able to press for continued production until 2002. Watches that used it, including the famous Sinn Model 140 “Space Chronograph” were unavailable once supplies were exhausted until alternatives like Sinn’s SZ01 could be developed.
In 2008, Tissot requested a low-cost mass-produced chronograph movement for entry-level Swiss watches. ETA created Cal. C01.211 based on the Lemania 5100 design. Jewel count was reduced to 15, operation slowed to 21,600 A/h, and the minute counter was moved to the 12:00 position.
Introduced in 1974, Cal. 5100 followed closely after the introduction of Lemania’s similar Cal. 1340 family. Like that movement, it features an unusual arrangement of chronograph counters:
- Central hour and minute hands, chronograph seconds, and 60 minute chronograph counter
- 12-hour counter at 6:00
- Small seconds at 9:00
- 24-hour hand at 12:00
- Day and date windows at 3:00
It has 17 jewels, hacking seconds, and power reserve of 48 hours, and operates at 28,800 A/h.
Cal. 5100’s predecessor, Cal. 1340, was refreshed and re-launched as a successor, Cal. 1350, in 1994. The basic Lemania 5100 design has been reused as the ETA C01.211.
Other versions using the Cal. 5100 ebauche:
- Omega Cal. 1045
- Lemania 5012 – 21,600 A/h version with no 24 hour register