18ct yellow gold Wrist Chronometer no. -

Case: 18ct yellow gold Dial: Silver, Breguet numerals, dial signed HR Ekegren, Geneve Movement: s/n; 90295, circular caliber 10 ligne, H.R. Ekegren made by E. Koehn, Geneva, Swiss, Eighteen18 jewels, eight 8 adjustments, 2 x Poincon de Geneve quality seals. Provenance: 1928 - HR Ekegren by E. Koehn, Geneve (but in all probability by Niton) 19?? - Watchmaker in the USA Exactly the same caliber was used by Niton and by Paul Piguet Capt.