The movement and tourbillon carriage with chronometer escapement of the present watch can be attributed to Edouard Golay, former student at the Ecole d'Horlogerie de la Valle in Le Sentier. The three bridge construction of the movement is based on Girard-Perregaux's celebrated tourbillon featuring three golden bridges, patented in 1884.
For a comparable movement and discourse on Edouard Golay see Das Tourbillon by Reinhard, Meis, pp. 51-52 and pp. 148-149. A drawing of Golay's tourbillon carriage is illustrated on p. 148, pl. 133.
The appeal of this rare example of finest Swiss watchmaking in the early 20th century is enhanced by the engraved coat-of-arms of the Khedive of Egypt and the retailer's signature L. Kramer & Co., Le Caire, Fournisseurs de S.A. Le Khedive, Horlogerie Soigne - L. Kramer & Co., Cairo, Suppliers to H.H. the Khedive, Fine Timepieces. Although hardly any information is available on this retailer, the signature appears on watches and chronometers of renowned watchmakers such as Longines and Thomas Russell & Son.
Based on the approximate year of manufacture of the watch, 1910, the ruler of Egypt at the time was Abbas II (1874-1944), the last khedive (viceroy) of Egypt from 1892-1914. Abbas II succeeded his father, Tewfik. He was deposed on 19 December 1914, and the khedivate passed, with the title of sultan, to his uncle Hussein Kamil Pasha (reigned 1914-1917).