The Piaget ownership contributed to the brand by adopting the Greek letter Phi and its associated Golden Ratio as symbols for Baume & Mercier. Piaget also provided technical expertise in the form of ultra-slim movements. Watches from this period are often found with Piaget movements. Also under the Piaget leadership, in 1973 Baume & Mercier introduced the Riviera, with its unique dodecahedral case. In production for more than 30 years this style has been integral to the brand’s success.
When Cartier launched their takeover of Piaget in 1988, control of Baume & Mercier came with it. Shortly thereafter, in 1993 all three brands were enveloped within the Vendôme Group, which was bought out by the Richemont group in 1998.
Shortly after being acquired by the Vendôme group, Baume & Mercier introduced their Hampton line. The commercial success of the Hampton was rapidly followed by the Hampton Milleis, Hampton Spirit and Hampton City.
data source: baume-et-mercier.com