18ct bi-color gold Wrist Chronometer no. 5508

Case: 18ct bi-color yellow and pink gold Dial: yellow gold with Breguet numerals and blued steel hands. Movement: s/n; 5508, unknown if it is a round caliber 9 ligne or a tonneau shaped caliber 9 x 11 ligne (?), 18 jewels, all adjustments, obtained 2 x Poincon de Geneve quality seals at May 31, 1929. Sadly, no picture of movement available. Serial number was validated by TimeLab as Niton. Provenance: 1929 - Niton, Geneve 1929 - HR Ekegren by Ed. Koehn, Geneve 1929 - J. E. Caldwell & Co., USA 2002 - Antiquorum - Geneva Antiquorum, Important collector's watches, wristwatches, Hotel Richemond, Geneva, Apr 13, 2002, LOT 441 H.R. Ekegren, Geneva, No. 5508, case No. 90433 signed Ed. Koehn, Geneva, retailed by J. E. Caldwell & Co. Produced in the 1930's. Very fine and rare, square, 18K pink and yellow gold Art Deco gentleman's wristwatch with concealed dial. C. three-body, bicolored, solid, polished and brushed, hinged cover and hooded lugs with pink gold geometrical designs, four buttons on the band, two of them serving to open the cover. D. matte silver with applied yellow gold Breguet numerals. "Breguet" yellow gold hands. M. Cal. 9''', stamped with the Geneva Quality Hallmark, rhodium-plated, 18 jewels, straight line lever escapement, cut bimetallic balance adjusted to all positions, self-compensating Breguet balance-spring. Dial, case and movement signed. Dim. 30 x 35 mm. https://catalog.antiquorum.swiss/en/lots/lot-26-441?browse_all=1&page=1&q=Ekegren+wristwatch