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Brand: | Concepto | 
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|---|---|---|---|
| Family: | |||
| Height: | 7.90 mm | ||
| Jewels: | 25 | ||
| Reserve: | 48 hours | ||
| Frequency: | 28,800 A/h | ||
| Winding: | Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding | ||
| Diameter: | 30.00 mm (13.25 ligne) | ||
| Complications: | 2-Button, Bilingual Day Wheel, Cam Switching Chronograph, Chronograph, Date, Day, Hacking Seconds, Hand Winding | ||
| Hands: | 12 Hour Chronograph Hand at 6:00, 30 Minute Chronograph Hand at 12:00, Central 60 Second Chronograph 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  Indexed Regulator |
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| Production: 2013 – Current | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. C99001 is a clone of the Valjoux 7750 produced by Concepto Watch Factory of La Chaux-de-Fonds. It was designed to be 100% compatible with that famous automatic chronograph, exactly the same size and design. One major differentiator was the use of Concepto’s in-house assortiment, including the balance, spring, and anchor.
Cal. C99001 was available in date (C99001-D), day-date (C99001-DD) or plain versions. The similar Cal. C99002 adds a central date pointer and relocates the day and month to the 12:00 subdial.
The following watches are known to use Cal. C99001:
- Sinn 103 St
- Sinn 103 St Sa
- Sinn 103 Ti Ar
- Sinn 144 St Sa
- Sinn 206 Arktis II
- Sinn 206 St Ar