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How to use the cal. 12 Chronosport Computergraph?

I recently got this Chronosport cal. 12 from Graham (VoodooSport)

I am interested in learning how the bezel or slide rule functions.

In this Chronosport 1969/70 brochure they call a similar watch “COMPUTERGRAPH”.

On the bezel and pressure ring it says “mph”, “km”, “press”, “alt”, “naut”, “stat” and “true alt.” On the 30 minute register the orange areas are from 3 to 6 and from 9 to 12.

All help is appreciated.

If anybody knows more about the hisstory of the watch I will of cause be very interested. Graham says that it was made by Kelek and on the bridge it reads JRGK.

Peter, Denmark
www.watchsite.dk

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