Swiss impressive watch made for the Ottoman market circa 1900

Diamond set gold enamel watch by Constantaras Frères
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An impressive diamond set gold enamel Swiss pocket watch made for the Ottoman market, circa 1900. Accompanied by an original silk lined Morocco case and made for Sultan Abdul Hamid II.
Frosted gilt 4/5 plate movement, screwed gold chatons, side lever escapement, gold screw compensation balance. 18 Carat gold case, the front and back cover fully engine turned and translucent red and blue grey enamelled and decorated with a stylized flower head, framed by a narrow opaque white enamelled border, the front cover costly decorated with cut diamonds; an engraved band with geometrical pattern, gold cuvette with enamelled Ottoman characters and a laurel wreath. Enamel dial with radial Ottoman numerals, auxiliary seconds and blued spade hands.
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Diameter: 52 mm
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Weight: 116 g
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Signed: Constantaras Frères
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Constantaras Frères
Constantaras Frères were the jewellers of his Majesty the Sultan, active in Constantinople in the late 19th, early 20th century. Abdul Hamid II (22 September 1842 – 10 February 1918) was the 34th Sultan of the Ottoman Empire and the last Sultan to exert effective autocratic control over the fracturing state.