Collection
Os slide rules
Watch name
Slide Rule Chronograph 2020
Dial
black
Reference
8557CALTH-b1
Case
Material
stainless steel (316L)
Glass
mineral
Surface
matt
Water resist
3 ATM
Glass back
yes
Size
47.5 mm
Crown
not screwed
Band
leather
Strap width
22 mm
Movement
Manufacturer
Dubois & Dépraz, Horlogère Micromécanique Suisse (since 1902)
Caliber
DD 2020
Date
no
Weekday
no
System
automatic
Energy
mechanical
Jewels
51
Vibrations
28´800 A/h
Special
The rotating bezel to perform general calculations and navigational computations.