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Brand: | ETA, Unitas | 
|
|---|---|---|---|
| Family: |
Unknown
|
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| Height: | 4.50 mm | ||
| Jewels: | 17 | ||
| Reserve: | 52 hours | ||
| Frequency: | 18,000 A/h | ||
| Winding: | Hand winding | ||
| Diameter: | 36.60 mm (16.5 ligne) | ||
| Complications: | |||
| Hands: | Central Hour Hand, Central Minute Hand, Lépine Small Seconds Hand, Small Seconds Hand at 9:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Hand-Winding  Clockwise Balance Cock  Etachron Regulator |
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| Production: 1967 – Current | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Calibres 6497 and 6498 date to about 1950. They remain in production as of 2019 and are used as a basis for training in many watch schools and are decorated and developed into many complicated movements. The movements were originally produced by Unitas before it was fully integrated with ETA. They were updated to “-1” spec around 1967, and the ETA name was applied only around 2005.
Clones of the ETA 6497-1 include the Hangzhou 9011 and Sea-Gull ST3600.
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.
