Rare Swiss deck watch with split-seconds chronograph Circa 1952

Steel electrical deck chronometer by Omega
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A rare, “electrical” Swiss deck chronometer with centre seconds, additional stoppable centre seconds hand and electrical and mechanical 30 seconds contact device, circa 1952.
Every 30 seconds a seconds contact device is activated for 7 seconds – with original box and Bulletin 1ère Classe de l’Observatoire Astronomique et Chronométrique de Neuchatel, dated June 24, 1952.
Steel polished case with movement protection cap, screw back and pusher for seconds stop at “1”. Signed enamel dial with Arabic numerals, “Omega Chronométrage inventory number”: 7, centre seconds and blued Éventail hands. 3/4 plate movement, rhodium-plated, with Geneva Striping decoration, finely ground chronograph steel parts, finely ground scissor-shaped double hand tong with separate ratchet wheel for split-seconds chronograph, hack feature, Guillaume screw compensation balance and index spring fine adjusting device.
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Diameter: 65 mm
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Weight: 237 g
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Signed: Omega S.A., Bienne, “Chronométrage”
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The “electric” split-seconds chronograph emits a visual and audible starting signal at five seconds before 30 seconds and the minute mark each.