Frédérique Constant SA is a Swiss manufacture of luxury wristwatches based in Plan-les-Ouates, Geneva, Switzerland. Originally established in 1988 by Dutch married couple Peter Stas and Aletta Stas-Bax, it was acquired in 2016 by Citizen Watch of Tokyo, Japan.
From the house's Wikidata and Wikipedia record (CC0 / CC BY-SA).