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Discussion Starter · #1 ·
Brand : Oris
model : Chronoris
Year : around 1970

calibre: handwound caliber 725 Oris.
diameter: 36-37mm without crown
height : 9mm


The upper Button is used for starting, stopping and reseting to zero the chrono
The medium crown is used for moving the internal tachymetric scale
The bottom crown is used for winding the watch and setting the hours

more information here (in french):
http://www.invenitetfecit.com/modeles/chronographes-sans-compteur.html








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Plain back
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Caliber:



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