Your absolutely right about this ! But , The watch pictured has a bridge style more in the lines of the Le Locle area .Matthey made VERY similar ebauches . They had a very distinct they of wrapping the bridges around the balance . As Hartmut said Jurgensen used a similar style.According to available records Tiffany & Co. did manufacture their own watches for a short period of time. Around 1874, with help from Patek Philippe, Tiffany Co. made their own watches, many with parts from PP, selling them under their own label and unmarked to custom watchmakers. Around 1879, the Tiffany watch making was merged with PP. There were approximately 20,000 watches made. Many are identified as a PP because of the parts used.