| Brand: | Sinn | 
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| Family: |
Unknown
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| Height: | |||
| Jewels: | 26 | ||
| Reserve: | hours | ||
| Frequency: | 28,800 A/h | ||
| Winding: | Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding | ||
| Diameter: | 30.0 mm | ||
| Complications: | 2-Button, Cam Switching Chronograph, Chronograph, Date, Date by Pointer, Day, Month, Week Number | ||
| Hands: | 60 Minute Chronograph Hand at 12:00, Central 60 Second Chronograph Hand, Central Date Pointer, Central Hour Hand, Central Minute Hand, Day Window at 11:30, Month Window at 12:30, Small Seconds Hand at 9:00, Week Number Hand at 6:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
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 Central-Rotor Automatic  Clockwise Balance Cock |
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| Production: 2014 – Current | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Sinn’s Cal. SZ03 is an automatic chronograph movement based on the ETA 7750.
Sinn has long used the ETA/Valjoux 7750 movement for their chronograph watches, but began reworking the movement in the 2003 as the SZ01. This was followed in 2014 by this Cal. SZ03. In addition to a 60 minute (rather than 30 minute) chronograph counter at 12:00, as in Cal. SZ02, Cal. SZ03 features an unusual calendar arrangement: Windows at 12:00 show the day of week and month, a central pointer shows the date, and the subdial at 6:00 shows the week number.
This movement was used in the Sinn 6052 Frankfurt Financial District Watch with calendar week display.