Swiss split seconds chronograph for sport timing Circa 1965

Chronograph with rating certificate by Omega
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A Swiss split seconds chronograph for sports timing, circa 1965. With the chronometer rating certificate of the Observatory Neuchatel and the Bulletin de Marche of the astronomy and chronometry observatory in Neuchatel of May 10, 1966.
Steel case with iron protective cap; black dial, split-seconds chronograph with 30-minute counter;  2/3 plate movement and Glucydur screw balance.
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Diameter: 65 mm
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Weight: 254 g
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Signed: Omega Swiss