In addition to a fascinating variety of features, the navigation chronograph 903 St B E boasts a functionally reliable dark blue dial with luminous ivory coated hands and indices. Watch lovers appreciate the attention to detail - and the impressive clarity in how the functions are arranged.
The chronograph also impresses those who enjoy performing analogue calculations with a classic slide rule. The positioning of an additional crown at 10 o’clock enables mathematical operations and is used to rotate the slide rule bezel with logarithmic scale. It also allows users to perform multiplication, division and cross-multiplication as well as other useful calculations such as fuel consumption, speed, distance and time. Additional watch features include a chronograph function for measuring and recording periods of time.
- Case made of stainless steel, polished / satinized
- Sapphire crystal glass
- Transparent case back made of sapphire crystal glass
- Dark blue dial and luminous ivory coating
- Interior bezel with logarithmic scale and slide rule function
- Pressure-resistant to 10 bar
- Low pressure resistant
Mechanical Movement
The information on the mechanical movement corresponds to the current production situation in Frankfurt am Main. Due to technical changes, it may happen in individual cases that stock items of our sales partners deviate from this information. (further Information)
- SW 500
- Self-winding mechanism
- 25 bearing jewels
- 28,800 semi-oscillations per hour
- Seconds stop function
- Anti-magnetic as per DIN 8309
Case
- Case made of stainless steel, polished / satinized
- Sapphire crystal glass in front, anti-reflective on both sides
- Transparent case back made of sapphire crystal glass, anti-reflective on the interior
- Case back screw-fastened
- Winding crown screwable
- Meet the technical requirements for waterproofness, as set out in standard DIN 8310
- Pressure-resistant up to 10 bar
- Low pressure resistant
Functions
- Hours, minutes, subsidiary seconds
- Date display
- Chronograph
- Interior rotating bezel with logarithmic scale (slide-rule function)
Dimensions and Weight
- Case diameter: 41 mm
- Band lug width: 22 mm
- Case thickness: 14,5 mm
- Weight without strap: 88 gramme
Dial and Hands
- Dark blue dial and luminous ivory coating
- Counters and interior bezel electroplated in silver
- Number "12” and indices coated with luminescent colour
- Hour and minute hand coated with luminescent colour
Warranty
- 2 years
| case material: | Steel |
| Movement: | Automatic |
| Gender: | Men's watch / Unisex |
| functions: | Chronograph |
