Swiss 18k gold minute repeater with chronograph Circa 1910

Yellow gold minute repeater with chronograph 
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A Swiss 18k yellow gold minute repeater with chronograph, circa 1910, 18K yellow gold, hunting cased, keyless winding, round-shaped, pocket watch, with subsidiary seconds at 6, minute-repeater on two steel gongs, 1/5 second chronograph. Cover and case back polished.
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Diameter: 52.5 mm
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Signed: Angelus
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Movement based on the Swiss invention patent No. 12 172, delivered on April 15, 1896, to Stolz Frères, Le Locle, for a “Régulateur silencieux, pour sonnerie de montres à répétition”.
Original fitted box; copies of invention patents.