Swiss stainless steel watch with chronograph Circa 1965

Black stainless steel chronograph watch
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A Swiss stainless steel open faced split seconds chronograph pocket watch made by Breitling in Grenchen, circa 1965. The black dial has Arabic numeral hour markers, an outer minute track, and a small azure silvered seconds subsidiary dial at 6 o’clock. And a 30 minute chronograph counter in an azure silvered subsidiary dial at noon, an outer scale for tenth of a second timing, and yellow glaive hands. It features a handwound mechanical movement with lever escapement, signed Breitling, Valjoux 9. Signature on the dial, case and movement.
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Diameter: 64 mm
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Weight: 275 g
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Signed: Breitling, Grenchen
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Accompanied by the original protective yellow leather fitted box.
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Three horological complications:
-Split seconds, activated by the round shaped push piece, on the case band at 11.
-Half instantaneous 30 minute counter, subsidiary dial at 12 o’clock. 
-1/10 second chronograph, activated by the single round push piece located on the winding crown.