developed into a partnership. While they are often associated with Vacheron Constantin, Verger also produced pieces for other fine firms, working for Cartier, Lacloche Freres, Marzo, Boucheron, Hermes, Van Cleef & Arpels, Ostertag, Jaeger, Chaumet, Janesich, Fouquet, Mauboussin, Marzchak, and American firms such as Charlton & Co., Trabert and Hoeffer, Udall and Ballon, J.E. Caldwell, Black, Star, & Frost, Spalding & Co., and Tiffany. Clients elsewhere included Hauser-Zivy y Cia in Mexico, Bulgari of Rome, Gübelin of Switzerland, and firms in England, Denmark, and other European cities. The creativity of Verger Frères is further substantiated by the number of patents for which they are responsible. Pieces made by Verger are not always marked. When they are, however, the mark is on the inside of the case, while the retailer's mark is usually found on the object?s surface. The finest of the Art Deco pieces are stamped with a lozenge bearing the initials ?VF?. Early pieces bear the early trademark, ?FV?, for Ferdinand Verger (after 1872); ?VF? in a lozenge, for Verger Frères, from 1911-1935; Georges Verger et fils, from 1935-1945; and Verger et Co., from 1945-1979.