sentences:  Its name is derived from the names of great-grandparents of each founder – specifically Frédérique Schreiner (1881–1969) and Constant Stas (1880–1967), the latter of which founded a company producing watch dials in 1904.In 2002, to diversify the Frédérique Constant group, Aletta and her husband acquired Alpina Watches, a manufacturer of Swiss sports watches founded in 1883.Frederique Constant has grown into one of the larger Swiss watch manufacturers.