The Unitas Watch Company was established in 1898 in Tramelan, Switzerland, by Auguste Reymond. [1, 2]
It became famous for rugged, reliable hand-wound mechanical movements and later merged into Ebauches SA and eventually the Swatch Group's ETA division. [1, 2, 3, 4]
Acquired by Auguste Reymond (ARSA) in 1926, joined Ebauches SA and ASUAG in 1932 (using a "T" inside "U" trademark), and was later absorbed into the ETA division of the Swatch Group
History & Background
- Founding: Auguste Reymond opened the company in 1898 and later acquired the Unitas Watch Company name in 1926 for ebauche (movement blank) production.
- Ebauches SA: Joined the Swiss movement cartel in 1932.
- ETA Integration: Absorbed into ETA SA in 1983, where flagship calibers continue to be manufactured. [1, 2, 3, 4]
Famous Calibers: Unitas 6497 & 6498
Introduced in the 1950s, the Unitas 6497 and Unitas 6498 are large, 16.5-to-19-ligne pocket watch movements that transitioned into popular oversized wristwatch calibers. [1, 2, 3, 4]
- Type: Hand-winding (manual-wind) mechanical movements. Specifications: Manual-winding, 36.6 mm diameter, 4.5 mm thickness, 17 jewels, 18,000 vph frequency, and a power reserve around 46 to 53 hours
- Jewels: Typically 17 jewels.
- Frequency: Standard beat rate of 18,000 beats per hour (vph), giving a traditional slow sweep, though later ETA versions increased to 21,600 vph.
- Power Reserve: Roughly 40 to 56 hours. [1, 2, 3]
Key Difference Between 6497 and 6498
ETA 6497 (Lépine) : Features the small seconds sub-dial at the 9 o'clock position (or 3 o'clock if oriented with the crown on the left).
Legacy in Modern Watchmaking
- Oversized Wristwatches: Popularized in large pilot and military-style wristwatches, most famously by brands like Panerai (which used modified 6497/6498 movements), IWC, Laco, and Glycine. [1, 2, 3]
- Watchmaking & Customization: Because of their large size, wide bridges, and durable architecture, they are the preferred base movements for watchmaking students, skeletonizing, and hand-engraving by independent artisans
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Several well-known watch brands use the Unitas movement:
- Panerai: Historically used the Unitas 6497 for iconic models like the Luminor (such as Calibres OP X and OP XI). [1, 2]
- Tissot: Features the Unitas 6498 in pieces like the Tissot Heritage 1936. [1]
- Laco: Uses the Unitas 6498 in its classic Navy/Marine-style watches (such as the Bremer Haven and Cox Haven). [1]
- Steinhart: Utilizes Unitas movements in various military, marine, and pilot watches (including the Steinhart Military 47). [1, 2]
- Maurice Lacroix: Features Unitas-based movements, including skeletonized variations. [1]
- Glycine: Equipped manual-wind lines like the Incursore with Unitas movements. [1]
- Eberhard: Features the Unitas in manual-wind models like the Traversetolo. [1]
- Archimede: Used the Unitas 6498 in large pilot watch configurations.
Modern Revivals
- Auguste Reymond S.A.: Continues to honor the heritage with the Auguste Reymond Origin Unitas series (such as the Origin Unitas AR.OR.07H.001.101.301 priced around 2,450 CHF / ~4,263 AUD), featuring hand-wound mechanical movements inside 44 mm steel cases. [1, 2]
- Other Brands: Independent and heritage brands like Duckworth Prestex (Prestex Skeleton) and MeisterSinger (MeisterSinger Unitas 1Z Edition) have also built anniversary or skeleton timepieces around the classic Unitas architecture. [1, 2]
The Tianjin Sea-Gull ST36 series watch movement is a direct clone and is based on the iconic Swiss Unitas (ETA) 6497 and 6498 pocket watch movements. [1, 2, 3]
Key Details
- The Clone: The Sea-Gull ST36 (including variants like the ST3600 and ST3620) is an unlicensed mechanical clone of the ETA/Unitas 6497 and 6498. [1, 2]
- ST3600 / ETA 6497: Corresponds to the Lépine style with the small seconds subdial located at the 9 o'clock position. [1, 2]
- ST3620 / ETA 6498: Corresponds to the Savonette style with the small seconds subdial located at the 6 o'clock position. [1, 2]
- Specifications: Like the original Unitas design, it is a hand-wound, 17-jewel mechanical movement running at 21,600 vibrations per hour (vph)
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