They did not and neither did Omega make the cases or movements and probably not the bracelets, crystals, pushers/crowns or hands either
The supremacy of Swiss watchmaking on the international arena is to a very large extent due to the Swiss concept of manufacturing; all the different parts were produced by specialist companies on order of a brand who would then put the parts together and (often in a coglomerate with other brands) market and sell the product to importers/wholesellers in the various countries.
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