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General| Brand | Sinn |
|---|---|
| Model | 903 Series |
| Case Material | Stainless Steel |
| Case Diameter | 41 mm |
| Case Thickness | 14.5 mm |
| Crystal | Sapphire |
| Dial Color | Black |
| Strap Material | Leather or Stainless Steel |
| Lug Width | 22 mm |
| Water Resistance | 100 m |
| Functions | Chronograph, Date |
History of Sinn Spezialuhren, founding by Helmut Sinn, and current leadership in Frankfurt.
Highlights the meticulously designed dial and clear arrangement of functions in the Model Series 903.
Explains the chronograph's slide rule feature for performing calculations.
Details the watch's caliber, winding, frequency, shock/magnetic resistance, and functions.
Describes case material, crystal, water resistance, dimensions, and other case features.
Instructions for winding, time setting, and quickset date adjustment using crown positions.
Explains how to operate the chronograph for measuring time intervals.
Details on performing multiplication, division, and rule of three calculations with the slide rule bezel.
Information on how to send your watch for inspection, repair, or reconditioning.
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